When does a fuse cut off current? How does it do it? b) What is the maximum number of 60W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5A fuse?

1. A fuse cut off current means when the current exceeds the safe vales and the fuse wire starts to melt and break the circuit. This is known as a fuse cut off current.
2. Given, V = 220V I = 5A

Let the maximum number of bulbs be y Power of y bulbs, P = 60y

We know that, P =VI

60y = 1100

y = 18.33

Therefore, the number of bulbs required are 18.