An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio $\dfrac{\text{R}}{\text{R}'}$ is ……………

1. $\dfrac{1}{25}$

2. $\dfrac{1}{5}$

3. 5

4. 25

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be ……………

1. 100 W
2. 75 W
3. 50 W
4. 25 W

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be

1. 1:2
2. 2:1
3. 1:4
4. 4:1