It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil the same quantity of water using the same heating coil but with the current doubled?

Explanation:

This is one of those problems that you can solve on paper, but in the real world, likely the coil would burn out right before your eyes.

The theoretical answer should be 2 minutes, but if the coil burns out, you could sit there all day and watch it and nothing short of a miracle would persuade the water to boil.

compass can be used day and night, cloudy or sunny