Question

State two factors on which power spent by a source depends.Explain your answer with examples.

Answer 1

Power spent by a source depends on two factors: (i) The amount of work done by the source, and (ii) The time taken by the source to do the said work. Example: If a coolie A takes 1 minute to lift a load to the roof of a bus, while another coolie B takes 2 minutes to lift the same load to the roof of the same bus, the work done by both the coolies is the same, but the power spent by the coolie A is twice the power spent by the coolie B because the coolie A does work at a faster rate.