37 Ohm’s Law SYMBOLS U = Voltage in volts I = Current in amperes R = Resistance on ohms P = Power in watts Useful Formulae kW = kVA x pF kW = kW = kVA = kVA = kVA = Line Amps = Line Amps = hp x 746 1000 x Eff kW pF hp x 756 1000 x Eff x pF hp x 746 x 100 1000 x %Eff Line amps x Line volts x 1.732 x pF 1000 Line amps x Line volts x 1.732 1000 kW x 1000 Line volts x 1.732 x pF kVA x 1000 Line volts x 1.732 Line Amps = Horsepower = (hp) hp = hp = 1 Watt = 1 joule/second 1 hp = 746 Watts 1 hp = 746 joules/second hp x 746 Line volts x 1.732 x Eff x pF kVA x 1000 x Eff 746 Line amps x Line volts x 1.732 x Eff x pF 746 kVA x 1000 x Eff pF 746 VOLT-DROP Single Phase Service Voltage = 240V Max Permissible Vd = (2.5% Service Voltage) = 6V Max Unit Vd = 240 x 2.5 100 (Length of cable run) Max Vd x 1000 1 x distance
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