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The coils of a wattmeter have resistances 0.01Ω and 1000Ω; their inductances may be neglected. The wattmeter is connected as shown in the figure, to measure the power consumed by a load, which draws 25A at power factor 0.8. The voltage across the load terminals is 30V. The percentage error on the wattmeter reading is __________.
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- 0.015
- 1.5
- 15
- 0.15
Correct Option: D
Pload = 30 × 25 × 08 = 600W
| Now, loss in Pc = | = | = 0.9 W | ||
| RP | 1000 |
| ∴ Error = | × 100 = 0.15% | |
| 600 |
