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An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20° C? The temperature of boiling water is 100° C.
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- 6.3 min
- 8.4 min
- 12.6 min
- 4.2 min
Correct Option: A
Heat required to raise the temperature of 1kg water from 20°C to 100°C is given by Q = ms∆θ = (1× 4200 × 80) J
Power of kettle (P) = VI = (220 × 4)W
| ∴ Time taken = | = | = 381.81 sec = 6.36 min | ||
| P | 220 × 4 |
