| A | B |
|---|
| static electricity | An electrical charge that guilds up on on object; results from changes in matter. |
| most of the time, matter is electrically _____. | neutral |
| Objects with opposite charges ________ each other. | attract or pull |
| Objects with the same charge ______ each other. | repel or push away |
| Static electricity stays in an object ______. | until something happens to remove it. |
| current electricity (a steady stream of charges) | an electric current moves through a material; can be more easily controlled than static electricity |
| circuit | a closed path in which charges flow around without starting or stopping. |
| series circuit | A circuit that has only one path for the current to follow. |
| parellel circuit | Has more than one path for the electric current to follow. If something stops charges from moving along one path, they can take another. |
| conductors | Let electric charges move through them easily |
| insulators | do not let electric charges move through them easily. |
| magnet | An object that attracts iron and a few (not all) other metals. |
| magnetic poles | The two places at which the force of a magnet is the strongest. |
| The two magnetic poles are | "N" and "S" |
| magnetic field | The space around a magnet in which the force of the magnet acts. |
| When coils wrap around an iron core, the core becomes an _______. | electromagnet |
| generator | a device that produces an electric current |
| electric motor | A device that changes electric energy into mechanical energy. |
| potential energy | Objects that have energy because of their position or because of what is done to them. |
| kinetic energy | When an object moves or the energy of motion. |
| hydroelectric power | Changing the kinetic energy of falling water into electrical energy. |
| solar energy | The energy of sunlight. |
| chemical energy | Energy stored in the arrangement of particles of matter; makes batteries work |
| mechanical energy | makes machine parts move |
