Question

1.
An electric fan becomes warm if used continuously because
a) A part of source energy is used to useful work
b) A part of source energy is converted into heat
c) Ohm's law of electric current
d) A part of source energy is used to rotate the blades​

Answer 1

'B' is the answer

Explanation: A fan becomes hot when used continuously because part of the electrical energy is used to drive the fan while the part is dissipated as heat. So if we use it consistently, there is a continuous heat dissipation which heats the fan. It is based on "Law of Conservation of Energy".

Hope it helps uh☺️