Object: A heating pad.

Good morning, boys and girls. How many of you have ever used a heating pad? (Let them answer.) When do you like to use it the most? (Let them answer.) Those are all good times, but I suppose that the best time for all of us to use the heating pad is when we do not feel too well. If we have an earache or a backache, or any kind of an ache, it is always good to use the heating pad. There is that nice warm feeling that seems to make us feel better.

I want you to feel my heating pad and then tell me what caused it to make me feel better. (Pass the heating pad among the children.) What is it that gives this heating pad the power to make me feel better? (Let them answer.) That's right, it is electricity. The pow…