Question

Calculate the power of a light bulb that uses 40j of electricity in 4 seconds​

Answer 1

To find:

The power of a light bulb that uses 40j of electricity in 4 seconds.

Calculation:

Power is defined as the instantaneous rate of doing work.

$\therefore \: power = \dfrac{work}{time}$

$= > \: power = \dfrac{40 \: J}{4 \: s}$

$= > \: power = 10 \: J {s}^{ - 1}$

$= > \: power = 10 \: watt$

So the final answer is:

$\boxed{ \bf{ \: power \: delivered \: by \: bulb = 10 \: watt}}$