A battery-operated switch offers an easy introduction to circuit-building and DC electricity concepts. A switch is a mechanical device that operates an electrical contact. When the contact is open, no current flows. Closing the contact completes the circuit, allowing current to run a motor, light or other component. The low voltages produced by household batteries make these types of circuits safe for beginning hobbyists. An elementary circuit such as this typically takes less than 15 minutes to build. You can find all the necessary parts at a local electronics store such as Radio Shack. Tips Warnings Writer Bio
