Define current, give its mathematical expression. What is its $SI$ unit ?
The flow of charge through a conducting wire connected to a cell is the result of chemical reaction inside the cell.
An electric iron draws a current of $0.5\, A$ when the voltage is $200$ volt. Calculate the amount of electric charge flowing through it in one hour.
Unit of electric power may also be expressed as
What is the resistance of an ideal voltmeter ?