| A | B |
|---|
| alternating current | An electric current that reverses its direction of flow at regular intervals. |
| ampre | A unit used to measure current. |
| charge | A measure of the amount of electricity in an atom that is determined by the extra positive or negative particles that an atom has. |
| circuit | A closed path along which electricity flows. |
| compass | This has a magnetized needle that is attracted to the eart's north magnetic pole. |
| conductor | Material that allows current to flow easily |
| direct current | An electric current flowing only in one direction |
| electric field | The area aound charged particles where electric forces occur. |
| electricity | Energy formed by the motion of protons and electrons. |
| electromagnet | A magnet created when electric current flows through a coil of wire. |
| fuse | A safety device placedin an electric circuit. This contains a metal strip that melts when overheated. |
| generator | A machine that produces |
| ground | An electrical connection that allows electrons to be carried away in the event of a problem. |
| insulator | Material through which a curr |
| kilowatt-hour | The amount of energy used when you consume on kilo-watt of power in one hour. |
| lightneing rod | A piece of metal that stands at the highest point of a building and is connected to the Earth. The purpose of the piece of metal is to ground the large amount of electrical energy in the event of a lightening strike. |
| lodestone | A hard, black, naturally magnetic rock. |
| magnet | An object with two poles that attracts iron and steel. |
| magnetic field | The space around a magnet where the force of the magnet can be felt. |
| parallel circuit | An electric circuit that has more than one path for the current. |
| resistor | Material that slows down or resists the flow of current. These are used in electric circuits to help control the flow of current. |
| series circuit | An electric circuit that has only one path for the current. |
| short circuit | A path that allows most of the current in an electric circuit to flow around or away from the principal elements or devices in the circuit. |
| static electricity | A charge that stays on an object instead of flowing in a current. |
| voltage | The force that pushes electricity or a current. In most homes the force is 110 volts. |
