Solved Sample Paper 2 — Question 25

(a) Advantages of a ring system are —

1. Each appliance has a separate fuse. Therefore, if due to some fault, the fuse of one appliance burns, it does not affect the operation of the other appliances.
2. In this system all the plugs and sockets used can be of same size, but each socket should have it's own fuse of rating suitable for the appliances to be connected with it.

(b) The relation between electrical power, resistance and potential difference in an electrical circuit is given by:

P = $\dfrac{\text{V}^2}{\text{R}}$