Description : Why can't we put metal in microwaves, but many microwaves have metallic walls/roof?
Last Answer : When you put metal objects in the microwave, they function as an antenna, conducting electricity. Since most microwaves are putting out around 800-1500w, that's a lot of electricity to put into a piece of ... in it, is also a shield, with the little holes letting light, but not microwaves, out.