Question

2. (a) On a bulb, it is written 60W; 220V. What is the meaning of these two
values?
(b) What is the maximum value of current that can flow into the bulb
without damaging it?​

Answer 1

Answer:

A. A bulb which is rated with 60W and 220V denotes that the bulb consume 60W power and 220V potential difference.

B. The maximum current which can flow through a fuse without melting it is called its rating.

For example a fuse rated at 8 A, can stand current upto 8 A. If current higher than 8 A flows through the fuse, it would melt and circuit gets broken.the rating of a fuse depends upon the thickness of the fuse wire (because length of the wire is fixed). The thicker fuse has higher rating. So, the thickness of the fuse wire in 8 A circuit is more than that of the fuse wire in 5 A circuit.