Current:
The rate of flow of electrons or charge through a conductor is called current or in short the rate of flow of charge is called current. In a word, electric current means the flow of electrons or charges. It is expressed by “I”, the unit ampere.
Voltage:
The pressure applied to make electrons or charges flow in the conductor is called voltage or electric pressure. In other words, the pressure applied to make the free electrons in the conductor flow in a certain direction is called voltage. It is expressed by V, the unit volt.
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Resistance:
The characteristic or behavior of a conductor that hinders the current flowing through it is called resistance. It is expressed by R, the unit Ohm.
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Power of load:
The product of the current and voltage flowing through a load is called the power of the load I is expressed by P, its practical unit is Watt.
P= VXI COS∅ Watt , COS∅ =power factor