An immersion heater is rated 836 watt. It should heat 1 litre of water from to in about
200 sec
150 sec
100 sec
120 sec
As we learnt in
Power dissipated in external resistance -
-
Amount of energy required = m s T
= 1 kg (4.18 J/g) 30
= 4180 30J= 125400J
Time required =
Option 1)
200 sec
Incorrect
Option 2)
150 sec
Correct
Option 3)
100 sec
Incorrect
Option 4)
120 sec
Incorrect