Electrical Power Calculations
Flashcard
•
Construction
•
Vocational training
•
Practice Problem
•
Easy
Mark Frost
Used 3+ times
FREE Resource
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5 questions
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1.
FLASHCARD QUESTION
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
2.
FLASHCARD QUESTION
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
3.
FLASHCARD QUESTION
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
4.
FLASHCARD QUESTION
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)
5.
FLASHCARD QUESTION
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
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