Question

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

Answer 1

Answer:

(i) The amount of work done by the source, and (ii) The time taken by the source to do the said work.

Explanation:

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.

Answer 2

Answer:

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.

Explanation:

• The rate at which work is done is referred to as power.
• Therefore, power is work done/ time.
• Power is a scalar quantity and its SI unit is Joules per Second (J/s).
• Power depends on two factors:-

1. Amount of work done
2. Time taken

• Power is directly proportional to the amount of work done and is inversely proportional to the time taken.
• Thus, the greater the amount of work done in less time, the more is power.
• For example, if a coolie A lifts weight to the roof of a bus in 1 minute and another coolie B lifts the same load to the roof of the same bus in 2 minutes, the work done by both coolies is the same, but the power expended by the coolie A is double that of the coolie B since the coolie A works quicker.

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