Electrical Power Calculations

Front

What is the input power to a single phase motor with a power factor of 0.6, current of 10A, and supply voltage of 230V?

Back

Input power = Voltage x Current x Power Factor = 230V x 10A x 0.6 = 1380W or 1.38 kW

Front

Calculate the total input power to a single phase motor that draws 20A from a 232V supply with a power factor of 0.95.

Back

Input power = Voltage x Current x Power Factor = 232V x 20A x 0.95 = 4394W or 4.39 kW

Front

What is the Apparent Power for a total load of 60 kW at 20 kVAr lagging?

Back

Apparent Power (kVA) = √(kW² + kVAr²) = √(60² + 20²) = √(3600 + 400) = √4000 = 63.25 kVA

Front

Calculate the Power Factor for an industrial installation with a load of 90 kW and Apparent Power of 80 kVA.

Back

Power Factor (pf) = P / kVA = 90 kW / 80 kVA = 1.125 (not possible, check values)

Front

What is the Apparent Power and power factor for a small college with a total load of 120 kW at 80 kVAr lagging?

Back

Apparent Power (kVA) = √(kW² + kVAr²) = √(120² + 80²) = √(14400 + 6400) = √20800 = 144.22 kVA; Power Factor (pf) = P / S = 120 kW / 144.22 kVA = 0.831