Physics · Three-Phase AC Circuits

For a balanced three-phase system, what is the correct formula for total active power (P) in terms of line voltage (VL), line current (IL), and power factor (cos φ)?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1P = 3 √3 VL IL cos φ
2P = VL IL cos φ
3P = 3 VL IL cos φ
4P = √3 VL IL cos φ✓

Correct answer

P = √3 VL IL cos φ

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For a balanced three-phase system, what is the correct formula for total active power (P) in terms of line voltage (VL), line current (IL), and power factor (cos φ)?

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For a balanced three-phase system, what is the correct formula for total active power (P) in terms of line voltage (VL), line current (IL), and power factor (cos φ)?

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