CBSENEETJEEClass 11
What is power in physics?
Answer
Power is the rate of doing work or the rate of transfer of energy, given by power = work ÷ time, with SI unit watt (W).
The working
Definition
Power is the amount of work done or energy transferred per unit time. It measures how fast work is being done.
Formula
Power (P) = work done (W) ÷ time taken (t). It can also be written as P = force × velocity for a constant force.
Unit
The SI unit of power is the watt, where 1 watt equals 1 joule per second. It is a scalar quantity.
Example
A more powerful machine does the same work in less time. One horsepower equals about 746 watts.
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