Question

Calculate the energy consumed by 120W toaster in 20 min .

Answer 1

In order to answer this question we have to know about energy . To calculate the amount of energy we use this formula – Energy (E) $=$ Power(P) $\times$ time (t).

Complete answer:
Energy is known as the product of work power and required time i.e. the capacity of work .
From the above question we get ,
Power $= 120watt$,
AND
time $=20\min$ $= 20\times 60s= 1200s$

$\therefore$ Energy (E) $= 120\times 1200=144000J= 144KJ$.
Therefore the amount of energy consumed by toaster is $144KJ$

Note: Joule is the unit of energy and equal to the energy used in applying a power of one newton through a distance of one meter. The total system’s energy is conserved in a closed system according to the law of conservation of energy.