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One single-phase wattmeter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant in revolutions is 400. The power factor of the load will be _________
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- 0.8
- 0.5
- 0.4
- 0.9
Correct Option: A
Energy consumed = 230 × 5 × 5 = 5750 Wh
= 5.57 kWh Revolution constant = 400 rev/kWh
| ∴ kWh = | = 4.8 | |
| 400 |
| Power factor = | = 0.8 | |
| 5.75 |
