Electrician Red Seal · Question
A single-phase 120 V motor draws 10 A and has a power factor of 0.6 lagging. What is the approximate reactive power consumed by this motor?
First, calculate apparent power (S) = V * I = 120 V * 10 A = 1200 VA. Active power (P) = S * PF = 1200 VA * 0.6 = 720 W. Reactive power (Q) can be found using t
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Question: A single-phase 120 V motor draws 10 A and has a power factor of 0.6 lagging. What is the approximate reactive power consumed by this motor?
Answer options:
- 720 VAR
- 480 VAR ✅ 960 VAR
- 1000 VAR
Correct answer: 960 VAR
Explanation: First, calculate apparent power (S) = V * I = 120 V * 10 A = 1200 VA. Active power (P) = S * PF = 1200 VA * 0.6 = 720 W. Reactive power (Q) can be found using the power triangle: Q = √(S² - P²) = √((1200 VA)² - (720 W)²) = √(1440000 - 518400) = √921600 = 960 VAR.
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