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Three equal resistors connected across a source of e.m.f. together dissipate 10 watt of power. What will be the power dissipated in watts if the same resistors are connected in parallel across the same source of e.m.f.?
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- 10
- 10/3
- 30
- 90
Correct Option: D
In series, Equivalent resistance = 3R
| Power = | V² | ⇒ 10 = | V² | ⇒ V² = 30R |
| 3R | 3R |
| ∴ Equivalent resistance R'= | ||
| 3 |
| ∴ Power = | V² | = | 30R | = 90 W |
| R' | R/3 |
