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Average ac power equals Vrms times Irms times which factor?
ATwice the phase angle
BThe cosine of the phase angle
CThe tangent of the angle
DThe sine of the phase angle
Answer & Solution
Correct answer: B. The cosine of the phase angle
Only the component of current in phase with the voltage does work, giving P = V I cos(phi), where cos(phi) is the power factor.
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