Question

When the speed of a dc motor increases the armature current

• A. Increases
• B. Decreases
• C. Does not change
• D. Increases and decreases continuously

Answer 1

Answer: (B)

Decreases

Answer 2

With the increasing speed, ω increases. Thus current reduces due to increase in the back e.m.f.

Moreover $i = \frac{V - K\omega}{R}$. More ω will lead to the lesser current.