The flow of charge through a conducting wire connected to a cell is the result of chemical reaction inside the cell.

An electric iron consumes energy at a rate of $840\, W$ when heating is at the maximum rate and $360\, W$ when the heating is at the minimum. The voltage is $220\, V$. What are the current and the resistance in each case?

What is the unit of electric potential difference?

Resistance of a conductor increases with the increase in temperature.

What type of electric charge does an electron possess?

What is the resistance of an ideal voltmeter?