is an electronic circuit?
A circuit is a structure that directs
and controls electric currents, presumably to perform some useful
function. The very name "circuit" implies that the structure is
closed, something like a loop.
Charge is mobile and can flow freely in certain
materials, called conductors. Metals and a few other elements and
compounds are conductors. Materials that charge cannot flow through
are called insulators. And then there are some materials called
semiconductors, that seemed to be good conductors sometimes but much
less so other times. Silicon and germanium are two such materials.
The flow of charge is called electrical current. Current is measured
in amperes (a), amps for short.
Voltage is something is a type of "pressure" that drives electrical
charges through a circuit.
charges attract, they exert a force on each other pulling them
together. The magnitude of the force is proportional to the product
of the charge on each mass.
What is charge?
may be defined as the quantity of unbalanced electricity in a body
(either positive or negative) and construed as an excess or
deficiency of electrons.
Charge comes in two forms,
positive (+) , and negative charge ( - ) .
A Resistor is
an electrical device that resists the flow of
electrical current. It is a passive device used to
control, or impede the flow of, electric current in an
electric circuit by providing resistance, thereby developing
a drop in voltage across the device.
The value of a resistor is measured in ohms
and represented by the Greek letter capital omega. Resistors usually
have a brown cylindrical body with a wire lead on each end, and
colored bands that indicate the value of the resistor.
Ohm's law describes the relationship between
voltage, V , which is trying to force charge to flow, resistance, R
, which is resisting that flow, and the actual resulting current I .
the Electric energy produced per unit time.
In simple words, we can say that a capacitor is a device
used to store and release electricity, usually as the result
of a chemical action. Also referred to as a storage cell, a
secondary cell, a condenser or an accumulator. A Leyden Jar
was an early example of a capacitor.
An inductor is
an electrical device (typically a
conducting coil) that introduces inductance into a circuit.
An inductor is a passive electrical component designed to
provide inductance in a circuit. It is basically a coil of
wire wrapped around an iron core. simplest form an inductor
is made up of a coil of wire. The inductance measured in
henrys, is proportional to the number of turns of wire, the
wire loop diameter and the material or core the wire is
A conductor made with semiconducting
material. Semiconductors are made up of a substance with electrical
properties intermediate between a good conductor and a good
insulator. A semiconductor device conducts electricity poorly at
room temperature, but has increasing conductivity at higher
temperatures. Metalloids are usually good semiconductors.
Silicon, atomic number 14 on the periodic table, is a semiconducting
material from which integrated circuits (computer chips of all
types--processors, memory chips, etc.; CCDs; transistors; etc.) are
Silicon is one of the most common elements. Silicon is also the
semiconductor material out of which almost all modern transistors are
A Diode is
an electronic device that allows
current to flow in one direction only. It is a semiconductor that consists of a p-n junction. They are used
most commonly to convert AC to DC, because they pass the
positive part of the wave, and block the negative part of
the AC signal, or, if they are reversed, they pass only the
negative part and not the positive part.
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