Joule's law?

Question

Tell me practical example of Joule's first law of production of heat which is "h proportional to i^2".

Answer 1

The best example is probably heating elements. The metal bar inside an electric oven is a conductor. Current is pumped through the heating element, and its resistance creates the heat that cooks your food. The element glows red at this point. You also see this in curling irons, electric grills and stoves. It's also observed in a light bulb, where heat generation is not the intended application, but rather a side effect of light generation.

Answer 2

Joules law - Heat is hot and cold is not