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Currents An electric current differs from static electricity. In an electric current, charges move continuously, without stopping. A build up of charges on an object is called static electricity. The charges from static electricity build up, but don't flow. Conductors and Insulators A conductor is a material that lets a current of electrons flow freely through it. Normally, the conductors are made of metal, so energy can easily flow through. An insulator is the exact opposite of a conductor. They hold electrons in and don't let energy flow. They're not made of metal, and are more commonly made out of wood, plastic, rubber, or glass. Types of Currents An alternating current (AC) can be found in houses. The electrons move back and forth repeatedly, changing direction regularly. This is the type of power that comes out of your wall sockets. A direct current (DC) is found in batteries. The current of electrons moves continuously in the same direction and never goes back and forth. |
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