Question No. 3 on Current Electricity

anshu your post is not visible.. could you type this one?

2 litres of water(ρ=1kg/L) in an open lid isulated kettle is heated by an electric heater of power 1 kW. Heat is lost @ 160 J/s. Find the time taken for heating water from 20°C to 23°C.

specific heat capacity =4.2 kJ/(K kg)..

approximately this is the question

may be! :P

mcΔT=Pt-Rt

R=rate of heat loss!! :D