In cold weather, we wear heavy clothing to keep in our bodies warmth. In hot weather, we wear light clothing so the heat escapes from our bodies. Heat in our homes are helpful also. We use heat to cook our food and heat our homes. Heat also is good for hot water and it dries our clothes.
Heat runs machinery too.
The heat from burning fuels in engines makes airplanes, automobiles, and ships able to move. Electricity gives light and makes power to run all kinds of materials.