For a system with 230 V AC, 5 A current and lag of 30°, what's the reactive power?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2
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  1. 275 VAR
  2. 675 VAR
  3. 175 VAR
  4. 575 VAR

Answer (Detailed Solution Below)

Option 4 : 575 VAR
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Detailed Solution

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Concept:

Reactive power (Q) = V I sinϕ

Where,

V = Voltage in volt

I = Current in ampere

ϕ = phase difference between voltage & current

Calculation:

Voltage (V) = 230 V

Current (I) = 5 A

Phase difference (ϕ) = 30°

Q = 230 × 5 × sin30°

Q = 575 VAR
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