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Calculate the current drawn by an electric motor rated at 125 W when it is run on a d.c. supply of 25 V.

October 1, 2026Physics

ScanSolve AI Answer

Step-by-step solution

4 steps

a) (i)
X: Commutator (or Split-ring commutator)
Y: Carbon brushes

a) (ii)
An electric motor converts electrical energy into kinetic energy (or mechanical energy).

Identify the given values and the formula for power.
$P = 125 \text{ W}$ $V = 25 \text{ V}$
The formula relating power, voltage, and current is $P = V \times I$ .
Rearrange the formula to solve for current ( $I$ ).
$I = \frac{P}{V}$
Substitute the given values into the formula.
$I = \frac{125 \text{ W}}{25 \text{ V}}$
Calculate the current.
$I = 5 \text{ A}$
The current drawn is $\boxed{\text{5 A}}$ .