a) Name a device which helps to maintain a potential difference across a conductor(say, a bulb).
b) If a potential difference of 10V causes a current of 2 A to flow for 1 minute, how much energy is transferred?

a) A cell or a battery helps to maintain a potential difference across a conductor.

b) Given: The potential difference = 10v.

The current produced in 1 min = 2A.
 

To find: We have to find the energy transferred.

Solution: 

We know that Q = I X T.

=> Q =  2 x 60 = 120 C.

Now, work done is the energy transferred. Therefore,

Work done = Potential difference x charge moved

Work done = 120 x 10 = 1200J.