Question

An electric grinder of 120 W is used to grind grains for 1.5 minutes . The energy supplied by the grinder is

Answer 1

Given:

An electric grinder of 120 W is used to grind grains for 1.5 minutes.

To find:

Energy supplied by grinder?

Calculation:

Power is often defined as the instantaneous rate of work done. In other words , power can be calculated from the ratio of Work and time.

So, work is also represented by the energy expended by an operator to perform a function.

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

$\sf{ = > \:work = power \times time }$

$\sf{ = > \:work = 120\times (1.5 \times 60) }$

$\sf{ = > \:work = 120\times 8}$

$\sf{ = > \:work =960 \: joule}$

So, work done by the electric grinder is 960 Joule.