Question

A motor expends a given amount of energy in a certain period of time. If twice the energy is expended in half the time, its power is:

Answer 1

Energy per unit of time is known as power

so here let say initial power is P in which energy E expended in time interval t

so we can say

now energy expended is double while it took half time

so new power expended will be

so here we can say that now the power expended will be 4 times the initial power

Step-by-step explanation:

Answer 2

Energy per unit of time is known as power

so here let say initial power is P in which energy E expended in time interval t

so we can say

`P = (E)/(t)`

now energy expended is double while it took half time

so new power expended will be

`P' = (2E)/(t/2)`

`P' = (4E)/(t)`

so here we can say that now the power expended will be 4 times the initial power