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## Main Question or Discussion Point

My friend asks me this question, I have not worked it out.

I hope it is suitable to maths box .

The time to boil a small kettle of water using a electric coil is A minutes.

Q: How many minutes needed to boil a big kettle (two times the mass of water compared to the small kettle), if using the same coil. Consider no heat is transmitted away to the ambient.

I hope it is suitable to maths box .

The time to boil a small kettle of water using a electric coil is A minutes.

Q: How many minutes needed to boil a big kettle (two times the mass of water compared to the small kettle), if using the same coil. Consider no heat is transmitted away to the ambient.