The S.I. unit of electrical power is :

1. volt x ampere
2. volt/ampere
3. joule x second
4. none of the above

1 WH is equal to :

1. 3600 J
2. 360 J
3. 36 J
4. 3.6 J

The amount of heat produced in a wire on passing a current through it depends on:

1. the resistance of wire
2. the square root of current I passing through the wire.
3. the time for which current is passed.
4. Both (1) and (3)