Difference Between Terminology And Unit

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Terminology and units
Current
Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. The common symbol for current is the uppercase letter I.

Potential difference
The potential difference between two points.The units for potential difference are Joules per coulomb, or volts. (1 volt = 1 Joule/coulomb).

Electrical charge
Electric charge is carried by the electrons ( negative charge) and protons (positive charge) within an atom. The symbol for the electrical charge is Q.

Resistance
The symbol for the resistance is ohm Ω and as the ratio of the voltage applied to the electric current ,which flows through the circuit.You can find electrical resistance of a circuit component.

Conductance
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Capacitors:
Charge stored by capacitors Q = CV in operation as a reservoir
They are device that can store electric charge.It is the dielectric that separates two plates that the device.These plates have oppositely charged.The amount of charge it can store is known as capacitance.To calculate this you use :

Use of capacitors as a filter in AC circuits
When you use a AC supply (alternating current ).Capacitor are able to charge and discharge at a rate demanded by the speed or the flow of the supply.

Units of capacitance (farad and sub-units)
It is the capacitance of the capacitor ,which tells you how much of energy a capacitor can keep and it is the farad which helps you to measure it .The symbol for it is F.So, one Farad is the amount of capacitance that can store 1 Coulomb (while charged to 1 volt).However, the sub -unit are used when the unit of farad are very large for use in electronics .

Sub unit
Abbreviation
Standard notation micro Farads µF x 10-6 nano Farads nF x 10-9 pico Farads

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