Power factor equals which ratio?

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Multiple Choice

Power factor equals which ratio?

Explanation:
Power factor is the ratio of real power to apparent power, P over S. Real power (watts) is the actual energy used to do work, while apparent power (volt-amperes) is the product of RMS voltage and RMS current and includes the effects of reactive power stored in inductors and capacitors. The power factor also equals the cosine of the phase angle between voltage and current, so PF = cos(phi). This means it reaches 1 when voltage and current are perfectly in phase (purely resistive) and is less than 1 when reactive power is present.

Power factor is the ratio of real power to apparent power, P over S. Real power (watts) is the actual energy used to do work, while apparent power (volt-amperes) is the product of RMS voltage and RMS current and includes the effects of reactive power stored in inductors and capacitors. The power factor also equals the cosine of the phase angle between voltage and current, so PF = cos(phi). This means it reaches 1 when voltage and current are perfectly in phase (purely resistive) and is less than 1 when reactive power is present.

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