The number of electrons in 1 C charge is :

1. 6.25 x 10¹⁸
2. 6.25 x 10¹⁹
3. 6.25 x 10²⁵
4. 1.6 x 10^-19

If W joule of work is done in bringing a test charge Q coulomb from infinity to the point P, then electric potential V at point P is :

1. V = WQ
2. V = Q/W
3. V = W/Q
4. none of the above

The potential difference between two points in an electric circuit is measured by a …………… which is connected in …………… with the circuit.

1. voltmeter, series
2. voltmeter, parallel
3. ammeter, series
4. ammeter, parallel