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Some common three phase power equations can be expressed as
Wapplied = 31/2 U I cos Φ
= 31/2 U I PF (1)
where
Wapplied = real power (W)
U = voltage (V, Volts)
I = current (A, Amps)
PF = cos Φ = power factor (0.7 - 0.95)
For purely resistive load: PF = cos Φ = 1
For purely resitive load and power factor = 1, the real power in a 415 Voltage 20 Amps circuit can be calculated as
Wapplied = 31/2 415 (V) 20 (A) 1
= 14400 W
= 14.4 kW
W = 31/2 U I (2)
WBHP = 31/2 U I PF μ / 746 (3)
where
WBHP = brake horse power (hp)
μ = device efficiency
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