The S.I. unit of charge is:

1. Ampere
2. Coulomb
3. Ohm
4. Volt

The charge on an electron is :

1. +1.6 x 10^-19 C
2. -1.6 x 10^-20 C
3. +1.6 x 10²⁰ C
4. -1.6 x 10^-19 C

The current in a circuit is measured by …………… by connecting it in ……………

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

If n electrons pass through a cross-section of a conductor in time t, then current in conductor is :

1. I = $\dfrac{ne}{t}$
2. I = $net$
3. I = $\dfrac{nt}{e}$
4. I = $\dfrac{n}{et}$