Question

An electric motor transforms 125 J of electrical energy into mechanical energy in 3 minutes. What is the power of the motor?

Answer 1

Given:

The electric motor transforms electrical energy,

`E=125\text{ J}`

time taken in this transformation is,

`\begin{gathered} t=3\text{ m} \\ =3*60\text{ s} \\ =180\text{ s} \end{gathered}`

To find:

The power of the motor

Step-by-step explanation:

Power is the rate of change in energy. So,

`\begin{gathered} P=(E)/(t) \\ =(125)/(180) \\ =0.69\text{ W} \end{gathered}`

Hence, the power is 0.69 W.