Question

an eletric press consumes 120KJ of energy in 5 minutes, when the magnitude of current flowing through it is 2A. calculate the electric potential at which press operates.

Answer 1

$$\begin{gathered} Power=\frac{energy}{time} \\ energy=120kj=120\times 1000j \\ time=5min=5\times 60s \\ P=\frac{120\times 1000}{5\times 60}=400watt \\ P=VI \\ V=\frac{P}{I}=\frac{400}{2}=200volt \end{gathered}$$
Electric potential at which press is operating is 200 volt.