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42.An electric heater has a resistance of 12 ohm and is operated from a 220V power line . If no heat escapes from it ,how much time is required to raise the temperature of 40kg of water from 15^° C to 80^° C? |
| Answer» 42.An electric heater has a resistance of 12 ohm and is operated from a 220V power line . If no heat escapes from it ,how much time is required to raise the temperature of 40kg of water from 15^° C to 80^° C? | |