Question

1.
Write in brief, the working of an electric torch,
2.A student, while performing an experiment in the science laboratory, connected
an electric bulb to an electric cell through an electric switch. He noticed that the
bulb did not glow when the electric switch was set in its ON position. Mention
'any two reasons for this observation,
3.Separate out the devices, listed below, into categories that usually work with
(1) either batteries or mains (11) batteries only Gil) mains only,
kettle, iron press, calculator, toaster, mobile phone, washing machine, radio,
transistor, computer, microwave oven,​

Answer 1

Answer:

The first reason for the bulb to glow in the above circuit, the switch has to be in the on position and not its own off position.

The electric switch is the device that breaks or completes the ‘circuit’ and the ‘current flowing’ through the circuit.

The second reason might be a ‘break in the fuse’ or the ‘filament of the bulb’ which might break the path of the current flowing in the circuit.