A dc motor is connected to an emf of 12.0 V. The resistance of its windings is 2.0 Ω. At normal operating speed, the motor delivers 6.0 W of mechanical power. What current does it draw at normal operating speed?
A) 6.0 A
B) 0.50 A
C) 1.0 A
D) 3.0 A

Question

Quizplus · Accepted Answer

The current drawn by the motor is given by I = V/R, where V is the emf and R is the resistance of the windings. Substituting the given values, we get I = 12.0 V / 2.0 Ω = 6.0 A.

A Dc Motor Is Connected to an Emf of 12