At work we got a new kettle recently. It's a fancy one with a water filter in it. You fill up the top half of the jug and it goes through a Brita filter into the bottom half of the jug where the heating element is.
It got me wondering what would be faster to boil the water.
Given a fixed volume of water and a kettle that provides a fixed amount of energy over time...
Would the water boil quicker (I.e. Reach 100 degrees and turn the kettle off) if you were to wait for all the water to filter through before turning the kettle on. Or if you were to turn the kettle on as soon as the water started filtering.
By quicker here I mean the time between turning the kettle on and it turning itself off. Not bothered about the time before turning the kettle on.