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

1. Given,

Potential difference = 10V, Current, I = 2A

Time taken, t = 60s We know that:

I = Q/t

So, Q = I×t

Substituting the values, we get Q = 2 × 60 = 120

Therefore, charge moved is 120C We also know that,

Work done = Potential difference × charge moved

= 120 × 10

=1200J

Therefore, work done to move a charge of 120C is 1200J.