Question

A dc electric motor consumes 36000000 Joules when connected to a 0.25 kV supply for 60 minutes. Find the current taken from the supply?

Answer by choosing the closest answer of this question from the following choices.

a. 40 W

b. 30 A

c. 40 A

d. 10000 W

Answer 1

Gives

Energy (E)=36000000J

Supply voltage (V)=0.25KV

time =60min =3600sec

We know that

$P=\frac{E}{t}\rightarrow(1)$

$P=IV\rightarrow(2)$

equation (1)and(2) equal

$\frac{E}{t}=IV$

$I=\frac{E}{tV}$

$I=\frac{36000000}{3600\times250}$ =40A

Option (c) is correct option