Energy made available by the flow of
. Charge is the quantity of unbalanced electricity
in a body (either positive or negative) and construed as an excess or
deficiency of electrons.
"When we learned to
electricity into a
, we realized that our potential is endless."
What is Electricity
is the physical property of matter that causes it to
experience a force when placed in an
. There are two
types of electric charges: positive and negative. Like charges repel and
unlike attract. An object is negatively charged if it has an excess of
electrons, and is otherwise positively charged or uncharged.
describes any flow of electric charge through a
gas, liquid or solid. The properties and effects of electric discharges
are useful over a wide range of magnitudes. Electric discharges can convey
substantial energy to the electrodes at the ends of the discharge.
ability of a body to store an electrical charge.
of an electrical conductor
measure of the difficulty to pass an electric current
through that conductor.
is an atom or a
molecule in which the total number of
is not equal to the total
number of protons, giving the atom or molecule a net positive or negative
electrical charge. Ions can be created, by either
, which is the process by which an atom or a molecule
acquires a negative or positive charge by gaining or losing electrons to
Speed of Electricity
refers generally to the movement of electrons (or
other charge carriers) through a conductor in the presence of potential
and an electric field. The speed of this flow has multiple meanings. In
everyday electrical and electronic devices, the signals or energy travel
typically on the order of 50%–99% of the
speed of light
, while the
electrons themselves move (drift) much more slowly. The speed at which
energy or signals travel down a cable is actually the speed of the
electromagnetic wave, not the movement of
. Electromagnetic wave
propagation is fast and depends on the
of the material. In a vacuum the wave travels at
the speed of light and almost that fast in air. The
Speed of Sound
is 4.689 miles in second., 768 mph or 12.8 miles a
is the science of controlling electrical energy
electrically, in which the electrons have a fundamental role. Electronics
deals with electrical circuits that involve active electrical components
such as vacuum tubes, transistors, diodes, integrated circuits, associated
passive electrical components
, and interconnection technologies. Commonly,
electronic devices contain circuitry consisting primarily or exclusively
of active semiconductors supplemented with passive elements; such a
circuit is described as an electronic circuit.
relates to the study and manufacture (or
) of very small electronic designs
are electronics that have been
designed to use less
, e.g. notebook processors.
is a means of distributing
alternating-current electrical power. Polyphase systems have three or more
energized electrical conductors carrying alternating currents with a
definite time offset between the voltage waves in each conductor.
Polyphase systems are particularly useful for transmitting power to
electric motors. The most common example is the three-phase power system
used for industrial applications and for power transmission. A major
advantage of three phase power transmission (using three
opposed to a single phase power transmission, which uses two conductors),
is that, since the remaining conductors act as the return path for any
single conductor, the power transmitted by a balanced three phase system
is three times that of a single phase transmission but only one extra
conductor is used. Thus, a 50% / 1.5x increase in the transmission costs
achieves a 200% / 3.0x increase in the power transmitted.
are electronic systems with a continuously variable signal, in contrast to
digital electronics where signals usually take only two levels. The term
"analogue" describes the proportional relationship between a signal and a
voltage or current that represents the signal. The word analogue is
derived from the Greek word ανάλογος (analogos) meaning "proportional".
are electronics that handle
– discrete bands of analog levels – rather than by continuous ranges as
used in analog electronics. All levels within a band of values represent
the same information state. Because of this discretization, relatively
small changes to the analog signal levels due to manufacturing tolerance,
signal attenuation or noise do not leave the discrete envelope, and as a
result are ignored by signal state sensing circuitry
are those circuits or devices built entirely
from solid materials and in which the electrons, or other charge carriers,
are confined entirely within the solid material. While solid-state can
include crystalline, polycrystalline and amorphous solids and refer to
electrical conductors, insulators and semiconductors, the building
material is most often a crystalline semiconductor. Common solid-state
devices include transistors, microprocessor chips, and RAM. A specialized
type of RAM called flash memory is used in flash drives and, more
recently, solid-state drives to replace mechanically rotating magnetic
disc hard drive.
is a technology for assembling electronic circuits by
mounting electronic devices on flexible plastic substrates, such as
polyimide, PEEK or transparent conductive polyester film. Additionally,
can be screen printed silver circuits
on polyester. Flexible electronic assemblies may be manufactured using
used for rigid printed
circuit boards, allowing the board to conform to a desired shape, or to
flex during its use. An alternative approach to flexible electronics
suggests various etching techniques to thin down the traditional silicon
substrate to few tens of micrometers to gain reasonable flexibility (~ 5
mm bending radius).
NUS researchers achieve major breakthrough in flexible electronics
Failure Modes of Electronics
are failures that can be caused
by excess temperature, excess current or voltage, ionizing radiation,
mechanical shock, stress or impact, and many other causes. In
semiconductor devices, problems in the device package may cause failures
due to contamination, mechanical stress of the device, or open or short
is the frequency with which an engineered
system or component fails, expressed in failures per unit of time. It is
often denoted by the Greek letter λ (lambda) and is highly used in
is the process of collecting and analyzing
data to determine the cause of a failure, often with the goal of
determining corrective actions or liability.
is an electrical circuit that allows a current
to travel along an unintended path with no or a very low electrical
impedance. The electrical opposite of a short circuit is an "open
circuit", which is an infinite resistance between two nodes. It is common
to misuse "short circuit" to describe any electrical malfunction,
regardless of the actual problem.
Thermal Management of Electronics
. All electronic devices and
circuitry generate excess heat and thus require thermal management to
improve reliability and prevent premature failure. The amount of heat
output is equal to the power input, if there are no other energy
interactions. There are several techniques for cooling including various
styles of heat sinks, thermoelectric coolers, forced air systems and fans,
heat pipes, and others. In cases of extreme low environmental
temperatures, it may actually be necessary to heat the electronic
components to achieve satisfactory operation.
Electric GeneratorHuman Energy
is Alternating Current,
An electric current that reverses direction sinusoidally
a succession of waves or curves.
Current, An electric current that flows in one direction
is the rate at which
is the basic unit of electric current.
is the flow of electricity through a conductor
Speed of Electricity
is the the rate at which energy is drawn from a source. Voltage
is a unit of power
is a unit of electrical resistance equal to
the resistance between two points on a
when a potential difference of one volt
between them produces a current of one ampere.
When in doubt, call a professional
An electrical impulse as small as 14 milliamps is enough to kill a
is a tradesperson specializing in electrical
wiring of buildings, stationary machines, and related equipment.
Electricians may be employed in the installation of new electrical
components or the maintenance and repair of existing electrical
infrastructure. Electricians may also specialize in wiring ships,
airplanes, and other mobile platforms, as well as data and cable.
Electrical Safety Inspection Check List
Electrical Safety Inspection List
Safety Check List
is the electrical wiring and associated devices such as
switches, meters and light fittings used in buildings or other structures.
Electrical wiring uses insulated conductors.
(for reference only, colors may change)
Meanings by Country
Define Electronics Terms
is composed of individual electronic components
such as resistors, transistors, capacitors, inductors and diodes,
connected by conductive wires or traces through which electric current can
flow. The combination of components and wires allows various simple and
complex operations to be performed: signals can be amplified, computations
can be performed, and data can be moved from one place to another.
is a graphical representation of an electrical circuit. A pictorial
circuit diagram uses simple images of components, while a schematic
diagram shows the components and interconnections of the circuit using
standardized symbolic representations. The presentation of the
interconnections between circuit components in the
does not necessarily correspond to the physical
arrangements in the finished device. Unlike a
, a circuit diagram shows the actual electrical connections. A
drawing meant to depict the physical arrangement of the wires and the
components they connect is called artwork or layout, physical design, or
wiring diagram. Circuit diagrams are used for the design (circuit design),
construction (such as PCB layout), and maintenance of electrical and
is an interconnection of electrical
(e.g. batteries, resistors, inductors, capacitors, switches) or a model of
such an interconnection, consisting of electrical elements (e.g. voltage
sources, current sources, resistances, inductances, capacitances).
is a two terminal device which can maintain a fixed voltage.
Topology (electrical circuits)
is what connections exist between the
Series and Parallel Circuits
connected in Series
are connected along a single path, so the same
current flows through all of the components.
Components Connected in Parallel
connected, so the same voltage is applied to each component.
circuits have multiple paths for the current to move along. If an item in
the circuit is broken, current will continue to move along the other
paths, while ignoring the broken one. This type of circuit is used for
most household electrical wiring. For example: when you turn off your TV,
it doesn’t also turn off your lights. Solar
When wiring solar panels in parallel
, the amperage (current) is
additive, but the voltage remains the same. eg. If you had 4 solar panels
in parallel and each was rated at 12 volts and 5 amps, the entire array
would be 12 volts and 20 amps.
Series circuits have only one path
for current to travel along. Therefore, all the current in the circuit
must flow through all the loads. A series circuit is a continuous, closed
loop - breaking the circuit at any point stops the entire series from
operating. An example of a series circuit is a string of old Christmas
lights - if one bulb breaks, the whole string turns off.
When wiring solar panels in a series
, the voltage is additive, but the
amperage remains the same. eg. If you had 4 solar panels in a series and
each was rated at 12 volts and 5 amps, the entire array would be 48 volts
and 5 amps.
Remember: just like batteries, solar panels have a negative
terminal ( - ) and a positive terminal ( + ). Current flows from the
negative terminal through a load (current consumed by a piece of
equipment) to the positive terminal.Human
is any basic discrete device or
physical entity in an electronic system used to affect
may be either a component that consumes (but does not produce) energy
), or a component that is incapable of power gain
is a type of low resistance resistor that acts as a
sacrificial device to provide overcurrent protection, of either the load
or source circuit. Its essential component is a metal wire or strip that
melts when too much current flows through it, interrupting the circuit
that it connects. Short circuits, overloading, mismatched loads, or device
failure are the prime reasons for excessive current. Fuses can be used as
alternatives to circuit breakers.
is a two-terminal electronic component that
conducts primarily in one direction (asymmetric conductance); it has low
(ideally zero) resistance to the flow of current in one direction, and
high (ideally infinite) resistance in the other.
is a passive two-terminal electrical component
used to temporarily store electrical energy
is a semiconductor device
used to amplify or
switch electronic signals and electrical power. It is composed of
semiconductor material usually with at least three terminals for
connection to an external circuit. A voltage or current applied to one
pair of the transistor's terminals changes the current through another
pair of terminals. Because the controlled (output) power can be higher
than the controlling (input) power, a transistor can amplify a signal.
Today, some transistors are packaged individually, but many more are found
embedded in integrated circuits
is a passive two-terminal electrical component that
implements electrical resistance as a circuit element. In electronic
circuits, resistors are used to reduce current flow, adjust signal levels,
to divide voltages, bias active elements, and terminate transmission
lines, among other uses.
also called a coil or reactor, is a passive
two-terminal electrical component which resists changes in electric
current passing through it. It consists of a conductor such as a wire,
usually wound into a coil. Energy is stored in a magnetic field in the
coil as long as current flows. When the current flowing through an
inductor changes, the time-varying magnetic field induces a voltage in the
conductor, according to Faraday’s law of
is a type of electrical circuit in which two circuit
branches (usually in parallel with each other) are "bridged" by a third
branch connected between the first two branches at some intermediate point
is an electro-mechanical device used to join
electrical terminations and create an electrical circuit. Electrical
connectors consist of plugs (male-ended) and jacks (female-ended). The
connection may be temporary, as for portable equipment, require a tool for
assembly and removal, or serve as a permanent electrical joint between two
wires or devices. An adapter can be used to effectively bring together
is an object whose purpose is to detect events
or changes in its environment
, and then provide a corresponding output. A
is a type of transducer; sensors may provide various types of
output, but typically use electrical or optical signals.
is an object or type of material that allows the flow of an electrical
current in one or more directions. A metal wire is a common electrical
crystalline or amorphous solids with distinct electrical characteristics.
They are of high resistance — higher than typical resistance materials,
but still of much lower resistance than insulators. Their resistance
decreases as their temperature increases, which is behavior opposite to
that of a metal. Integrated
is a 1,000 more times
conductive then copper.
is the first reported perovskite superconductor
that did not contain copper.
Electrical Resistance and Conductance
of an electrical
conductor is a measure of the difficulty to pass an electric current
through that conductor. The inverse quantity is electrical conductance,
and is the ease with which an electric current passes. Electrical
resistance shares some conceptual parallels with the notion of mechanical
friction. The SI unit of electrical resistance is the ohm (Ω), while
electrical conductance is measured in siemens (S).
is an association of two or
more molecules, or of different parts of one large molecule, in which a
fraction of electronic charge is transferred between the molecular
entities. The resulting electrostatic attraction provides a stabilizing
force for the molecular complex. The source molecule from which the charge
is transferred is called the electron donor and the receiving species is
called the electron acceptor.
is a phenomenon of exactly zero electrical
resistance and expulsion of magnetic flux fields occurring in certain
materials when cooled below a characteristic critical temperature.
is a synthetic organic compound
that exhibits superconductivity at low temperatures.
is characterized by the
formation of magnetic vortices in an applied
Room Temperature Superconductor
is a hypothetical material that would be capable of exhibiting
superconductivity at operating temperatures above 0° C (273.15 K). While
this is not strictly "room temperature", which would be approximately
20–25 °C, it is the temperature at which ice forms and can be reached and
easily maintained in an everyday environment.
is a material whose internal electric charges do
not flow freely, and therefore make it nearly impossible to conduct an
electric current under the influence of an electric field.
is the number of constituent particles,
usually atoms or molecules, that are contained in the amount of substance
given by one
which is the unit of measurement in the International System of Units (SI)
for amount of substance. It is defined as the amount of a chemical
substance that contains as many elementary entities, e.g., atoms,
molecules, ions, electrons, or photons, as there are atoms in 12 grams of
carbon-12 (12C), the isotope of carbon with relative atomic mass 12 by
definition. This number is expressed by the Avogadro constant, which has a
value of 6.022140857(74)×1023 mol-1. The mole is one of the base units of
the SI, and has the unit symbol mol.
is designed to automatically
maintain a constant voltage level. A voltage regulator may be a simple
"feed-forward" design or may include negative feedback control loops. It
may use an electromechanical mechanism, or electronic components.
Depending on the design, it may be used to regulate one or more AC or DC
was a Serbian-American inventor, electrical
engineer, mechanical engineer, physicist, and futurist who is best known
for his contributions to the design of the modern alternating current (AC)
electricity supply system. (10 July 1856 – 7 January 1943)
Build a Tesla Coil
Two men +
two Tesla coils + special suits = ELECTRICITY FIGHT!
Lords of Lightning
bacteria connect to form wires
Splice Wires Manly-Man Skills: The Lineman Splice
is an electronic device which, with the aid of
an antenna, produces radio
. The transmitter itself generates a radio frequency alternating
current, which is applied to the antenna. When excited by this alternating
current, the antenna radiates radio waves.
is a subsystem that receives radio frequency (RF)
transmissions like radio broadcasts and converts the selected carrier
frequency and its associated bandwidth into a fixed frequency that is
suitable for further processing, usually because a lower frequency is used
on the output.
is an electronic device that receives radio
waves and converts the information carried by them to a usable form. It is
used with an antenna. The antenna intercepts radio waves (electromagnetic
) and converts them to tiny alternating currents which are
applied to the receiver, and the receiver extracts the desired
information. The receiver uses electronic filters to separate the desired
radio frequency signal from all the other signals picked up by the
antenna, an electronic amplifier to increase the power of the signal for
further processing, and finally recovers the desired information through
is deviation of the attenuation affecting a signal
over certain propagation media. The fading may vary with time,
geographical position or radio frequency, and is often modeled as a random
is a measure used in science and
engineering that compares the level of a desired signal to the level of
background noise. It is defined as the ratio of signal power to the
, often expressed in decibels. A ratio higher than 1:1 (greater than
0 dB) indicates more signal than noise. While SNR is commonly quoted for
electrical signals, it can be applied to any form of signal (such as
isotope levels in an ice core or biochemical signaling between
decomposes a function of time (a signal) into the
that make it up, in a way similar to how a musical chord can
be expressed as the amplitude (or loudness) of its constituent notes. The
Fourier transform of a function of time itself is a complex-valued
function of frequency, whose absolute value represents the amount of that
frequency present in the original function, and whose complex argument is
the phase offset of the basic sinusoid in that frequency.
are sound waves with frequencies higher than the
upper audible limit of human hearing. Ultrasound is no different from
'normal' (audible) sound in its physical properties, except in that humans
cannot hear it. This limit varies from person to person and is
approximately 20 kilohertz (20,000 hertz) in healthy, young adults.
Ultrasound devices operate with frequencies from 20 kHz up to several
Wave or Particle?
is the number
of occurrences of a
per unit Time
. It is also referred to as temporal frequency, which
emphasizes the contrast to spatial frequency and angular frequency. The
period is the duration of time of one cycle in a repeating event, so the
period is the reciprocal of the frequency. For example, if a newborn
baby's heart beats at a frequency of 120 times a minute, its period—the
time interval between beats—is half a second (that is, 60 seconds divided
by 120 beats). Frequency is an important parameter used in science and
engineering to specify the Rate
of oscillatory and vibratory phenomena,
such as mechanical vibrations, audio (Sound
is the ITU designation for radio frequencies (RF) in the
range of 3 kHz to 30 kHz and corresponding wavelengths from 100 to 10
is the unit of frequency in the
(SI) and is defined as one cycle per
As an SI unit,
Hz can be prefixed; commonly used multiples are
(kilohertz, 10 to 3p Hz), MHz
(megahertz, 10 to 6p Hz), GHz
10 to 9p Hz) and THz
, 10 to 12power
Cycle Per Second
or CPS was a once-common English name for the unit of
frequency now known as the hertz.
is a mathematical curve that describes a smooth
repetitive oscillation. It is named after the function sine, of which it
is the graph. It occurs often in pure and applied mathematics, as well as
physics, engineering, signal processing and many other fields.
of a sinusoidal wave is the spatial period of the wave—the
distance over which the wave's shape repeats, and thus the inverse of the
is defined as the lowest frequency of
a periodic waveform. In music, the fundamental is the musical pitch of a
note that is perceived as the lowest partial present.
is the process of varying one or more properties
of a periodic waveform, called the carrier signal, with a modulating
signal that typically contains information to be transmitted.
is a modulation pattern that encodes information as
variations in the instantaneous phase of a carrier wave. The phase of a
carrier signal is modulated to follow the changing voltage level
(amplitude) of modulation signal. The peak amplitude and frequency of the
carrier signal remain constant, but as the amplitude of the information
signal changes, the phase of the carrier changes correspondingly. The
analysis and the final result (modulated signal) are similar to those of
frequency modulation. Phase modulation is widely used for transmitting
radio waves and is an integral part of many digital transmission coding
schemes that underlie a wide range of technologies like Wi-Fi, GSM and
satellite television. Phase modulation is closely related to frequency
modulation (FM); it is often used as an intermediate step to achieve FM.
Mathematically both phase and frequency modulation can be considered a
special case of quadrature amplitude modulation (QAM). PM is used for
signal and waveform generation in digital synthesizers, such as the Yamaha
DX7 to implement FM synthesis. A related type of sound synthesis called
phase distortion is used in the Casio CZ synthesizers.
Alpha Theta Beta
is a mechanical phenomenon whereby oscillations occur about an equilibrium
point. The word comes from Latin vibrationem ("shaking, brandishing"). The
oscillations may be periodic, such as the motion of a pendulum—or random,
such as the movement of a tire on a gravel road.
Vibrations: The Science of Sound
Music for Plants
Life of Plants
An oscillation of the parts of a fluid or an elastic solid whose
equilibrium has been disturbed, or of an
person's emotional state, the atmosphere of a place, or the
associations of an object, as communicated to and felt by
others. A distinctive emotional aura experienced instinctively.
(physics) a regular periodic variation in value about a mean.
is the process of oscillating between states. A single complete execution of a periodically repeated
the repetitive variation, typically in time, of some measure about a
central value (often a point of equilibrium) or between two or more
different states. The term vibration is precisely used to describe
mechanical oscillation. Familiar examples of oscillation include a
swinging pendulum and alternating current power.
phenomenon in which a vibrating system or external force drives another
system to oscillate with greater amplitude at a specific preferential
is an interval during which a recurring sequence of events occurs.
Recur in repeating sequences.
A periodically repeated sequence of events. Cause to go through
a recurring sequence.
The unit of frequency; one hertz has a periodic interval of one
second. A single complete execution of a periodically repeated
Tools for Electronics
is an electronic device that supplies
electric energy to an electrical load. The primary function of a power
supply is to convert one form of electrical energy to another and, as a
result, power supplies are sometimes referred to as electric power
is a type of
electronic test instrument
that allows observation of constantly varying signal voltages, usually as
a two-dimensional plot of one or more signals as a function of time. Other
signals (such as sound or vibration) can be converted to voltages and
is an electronic measuring instrument that
combines several measurement functions in one unit. A typical multimeter
can measure voltage, current, and resistance. Analog multimeters use a
microammeter with a moving pointer to display readings. Digital
multimeters (DMM, DVOM) have a numeric display, and may also show a
graphical bar representing the measured value. Digital multimeters are now
far more common due to their cost and precision, but analog multimeters
are still preferable in some cases, for example when monitoring a rapidly
is a device that converts one form of energy to another
. Usually a
transducer converts a signal in one form of energy to a signal in another.
Transducers are often employed at the boundaries of automation,
measurement, and control systems, where electrical signals are converted
to and from other physical quantities (energy, force, torque, light,
motion, position, etc.). The process of converting one form of energy to
another is known as transduction.
Electronic Test Equipment
is used to create signals and capture
responses from electronic devices under test (DUTs). In this way, the
proper operation of the DUT can be proven or faults in the device can be
traced. Use of electronic test equipment is essential to any serious work
on electronics systems. Practical electronics engineering and assembly
requires the use of many different kinds of electronic test equipment
ranging from the very simple and inexpensive (such as a test light
consisting of just a light bulb and a test lead) to extremely complex and
sophisticated such as automatic test equipment (ATE). ATE often includes
many of these instruments in real and simulated forms. Generally, more
advanced test gear is necessary when developing circuits and systems than
is needed when doing production testing or when troubleshooting existing
production units in the field.
Amprobe AT-7030 Advanced Wire Tracer Kit
Traces wires in
walls, ceilings, floors and corners.
Locates breakers and fuses, Pinpoints shorts and opens.
Tesla’s Secret To Amplifying Power By Nearly 5000%
states that the current induced in a circuit due to a
change or a motion in a magnetic field is so directed as
to oppose the
change in flux and to exert a mechanical force opposing the motion.
Faraday's Law of Induction
is a basic law of
predicting how a magnetic field
will interact with an electric circuit to
produce an electromotive force (EMF)—a phenomenon called electromagnetic
induction. It is the fundamental
operating principle of transformers,
inductors, and many types of electrical motors, generators and solenoids.
is a type of alternating current (AC)
uses the principles of induction motors to produce power. Induction
generators operate by mechanically turning their rotors faster than
Elliptical Electric Rotor
is a moving component of an electromagnetic system in the
electric motor, electric
, or alternator. Its rotation is due to the interaction
between the windings and magnetic fields which produces a torque around
the rotor's axis.
is the opposition of a circuit element to a
change in current or voltage, due to that element's inductance or
capacitance. A built-up electric field resists the change of voltage on
the element, while a magnetic field
resists the change of current. The
notion of reactance is similar to electrical resistance, but it differs in
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