| A | B |
|---|
| Attract | To pull toward one another, as opposite poles of two magnets pull toward one another. |
| Battery | A source of electricity with more than one cell. |
| Circuit | A pathway for the flow of electricity. |
| Circuit base | Something that holds many components needed to build a circuit. |
| Closed circuit | A complete circuit through which electricity flows. |
| Coil | Wire wound repeatedly around a central core. |
| Compass | An instrument that uses a freely moving magnetic needle to indicate direction. |
| Conductor | A substance, commonly a metal such as copper or aluminum, through which electricity will flow. |
| Current | The flow of electricity through a conductor. |
| D-cell | A source of electricity; also known as a battery. |
| Detector | Something that helps you identify or locate something. |
| Electricity | A form of energy that can produce light, heat, and magnetism. |
| Electricity receiver | A component that uses the electricity from a source to make something happen. |
| Electricity source | Something that provides electric energy to make something happen. |
| Electromagnet | A piece of iron that becomes a temporary magnet when electricity flows through an insulated wire wrapped around it. |
| Filament | The material in a light bulb (usually a thin wire) that glows when heated by an electric current. |
| Force | A push or a pull. |
| Induced magnetism | The influence of a permanent magnet’s magnetic field on a piece of iron, which makes the iron act like magnet. |
| Insulator | A material that prevents the flow of electricity, commonly plastic, rubber, glass, or air. |
| Intersection | The point at which two lines cross. |
| Key | A switch that completes the circuit in a telegraph system. |
| Lightning | A flash of light caused by a discharge of static electricity between two clouds or from a cloud to the Earth. |
| Lodestone | A form of the mineral magnetite that is naturally magnetic or has become magnetized. |
| Long-distance | Something that is far away. |
| Magnet | An object that sticks to iron. |
| Magnetism | A property of certain kinds of materials that causes them to attract iron or steel. |
| Open circuit | An incomplete circuit through which electricity will not flow. |
| Parallel circuit | A circuit that splits into two or more pathways before coming together at the battery. |
| Pole | Either of two opposing forces or parts, such as the poles of a magnet. |
| Repel | To push away, as similar poles of two magnets push away from one another. |
| Schematic diagram | A way to represent a circuit on a piece of paper. |
| Series circuit | A circuit with only one pathway for current flow. |
| Static electricity | Positive and negative electric charges that are separated from each other and are not moving. |
| Switch | A device used to open and close circuits. |
| Telegraph | A device for sending coded messages by signals produced by closing and opening an electric circuit. |
| Temporary magnet | A piece of iron that behaves like a magnet when it is touching a permanent magnet. |
