Question

define power. drive its SI unit. an electric bulb is rated 15 watts. what does it mean? what is the energy consumed in joules, if it is used for 10 minutes

Answer 1

power is defined as the rate of doing work.when an electric bulb is rated as 15 watts it actually means it consumes energy of 15J/s. 15×600=9000J is used in 10 minutes. SI unit of of power is joule per second.it can be derived as follows:
power=energy÷time
=J÷s=J/per second

Answer 2

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