Capacitors
can be likened to water reservoirs, where the size of the water tank is a high
capacity, while the tube is the voltage. Capacitors are electronic components
that one belongs to the category of passive components. The function of the
capacitor greatly in need in the electronics component or electronic circuits.
capacitor is an electronic component whose role is to store an electrical
charge, not only that the capacitor can also be used as a frequency filter.
capacity to put the power of the electric charge in the capacitor is called the
farad (F), but the symbol of a capacitor is C (capacitor).
One
component of capacitors are usually made of two metal plates that are
parallel to each other and between the two metals is no material that is often
called a dielectric insulator. Dielectric is a material that can affect the
value of the capacitance of the capacitor function. As for the dielectric
material that is very much in use is ceramic, air, paper, metal films, glasses,
vacuum, and so forth.
Capacitors
are often referred to as a condenser. capacitors have a wide range of shapes
and sizes, depending on the capacity of the capacitor, the working voltage, and
so forth. function of the capacitor divided into two groups: a capacitor that
has a fixed capacity and a capacitor that has a capacity that can be changed or
in other words the variable capacitor.
The
basic properties are within a capacitor can store electrical charge, and also
has properties that can not flow through the dc (direct current) and can be
passed ac current (alternating current) and can also function as an impedance
(resistance whose value depends on the frequency obtained) .
The
function of a capacitor in an electronic circuit is a coupling, a phase
shifter, a filter on the power supply circuit, the frequency generator and an
oscillator circuit is also used to prevent sparks on a switch.
The
workings of the capacitor in a circuit is the flow of electrons to the capacitor.
when the capacitor has been filled with electrons, the voltage will naturally
change. Then, electrons will be out of a capacitor and flows into the circuits
that need it. Thus, the capacitor will generate reactive circuit.
But can
not deny, though the capacitors components have different shapes and sizes, but
the function of the capacitor continues sorely in need in the electronics
component or electronic circuits.
Computers also use capacitors. For example, a type of computer keyboard has capacitors at the bottom of its keys, as shown in the picture below. Every key is connected to a movable plate which acts as the first plate of a capacitor; the fixed plate at the bottom of the keyboard acts as the second plate of the capacitor. When a key is pressed, the distance between the upper plate (the moving plate) and the bottom plate (the fixed plate) changes from about 5 mm to about 0.3 mm. the deduction in the separation distance between the plates causes an increase in capacity. The external electronic circuits recognize every key based on its capacity when the key is pressed. Therefore, the information carried by the key will go into the computer.
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| when the keyboard button
is pressed, the capacity of the parallel plate capacitor increased due to the
decrease of the interpolate separation distance |