Some new kinds of musical instruments have no strings, no tubes, and nothing to tap or hammer on. These instruments use an electric current to make special sounds. An electric current makes tiny...
Lemon power
You can put your own \"package" of chemicals together to make a battery. A tiny magnet---a compass needle---will show you when the electric current is flowing. Ask a grown-up to use the knife to...
Making electricity safe
A light bulb uses only a little electricity. But electric stoves, refrigerators, and frying pans use as much electricity as dozens of light bulbs. Can you use too much electricity? What happens if...
Starting and stopping the push
You want your electric clock to run day and night. But you wouldn't want your doorbell ringing all the time! Things like doorbells, lamps, and radios work only when you turn them on. Most things...
A push in a wire
should go. Click! The minute you turn on a lamp or a radio, something happens---a light bulb glows or sounds come out. But electricity doesn't jump into the lamp or the radio. It flows through...
Rivers in the sea
> Ocean tides are caused mainly by the pull of the moon's gravity. High > tide occurs directly below the moon and, at the same time, on the > opposite side of the earth. The earth turns halfway...