Electrician Red Seal · Question
A technician is commissioned to connect a new 50 kW, 0.8 lagging power factor, 480 V, three-phase resistive-inductive load to an existing panel. What is the approximate total apparent power (kVA) that the new load will draw from the panel?
Apparent power (S) can be calculated from Real power (P) and Power Factor (PF) using the formula S = P / PF. Given P = 50 kW and PF = 0.8, S = 50 kW / 0.8 = 62.
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Question: A technician is commissioned to connect a new 50 kW, 0.8 lagging power factor, 480 V, three-phase resistive-inductive load to an existing panel. What is the approximate total apparent power (kVA) that the new load will draw from the panel?
Answer options: ✅ 62.5 kVA
- 50 kVA
- 40 kVA
- 75.0 kVA
Correct answer: 62.5 kVA
Explanation: Apparent power (S) can be calculated from Real power (P) and Power Factor (PF) using the formula S = P / PF. Given P = 50 kW and PF = 0.8, S = 50 kW / 0.8 = 62.5 kVA. The voltage information is extraneous for calculating apparent power if real power and power factor are known.
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