MY uncle taught me a trick for boiling an egg on an electric
oven.
He puts an egg in a pot of
water and puts it on an heating ring.
Then he turns the ring on and brings to the boil.
As soon as the water comes to the boil he switches the ring off and sets a timer.
There's no need for the ring to remain on once the water comes to the boil.
If you leave the egg in the
hot water for 7 minutes you have a hard boiled egg.
And you've used the minimum amount of electricity to cook it.