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How long does it take a 1000W electric kettle to bring 1.0L of water to the boiling point if the initial temperature of the water is 15ºC and the kettle is made of 400g of iron?

Assume that no water is boiled, that no heat is lost to the surroundings, and that the kettle is 100% efficient.

Well first thing I did of course is write givens:

Temperature(water, initial) - 15ºC

Temperature(water, final) - 100ºC

Specific Heat Capacity (water) - 4200 J/kgºC

Specific Heat Capacity (iron) - 460J/kgºC

Mass (iron) - 0.4kg

Mass water - 1.0L = 1kg

Power of kettle - 1000W

I know the p= W/T and e=mct formulas but I'm having trouble with applying the 1000W to the heat transfer formulas. The other questions I've done,only required me to do mcΔt = -mcΔt with some latent fusion/vapourization in there.

Confused where to start...

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# Homework Help: Thermal Energy and Heat Transfer

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