Core Science

1. a machine that converts kinetic energy into electrical energy by induction.
3. the parts of a magnet where its magnetic field is strongest.
6. a current that constantly changes direction.
7. the non-contact force of a magnetic field.
9. a length of wire that heats up and melts. If the current is too large, and so cuts off the electrical supply.
10. a device that increases or decreases the voltage of alternating current.
12. the force that pulls things together.
14. An electromagnetic device that cuts off the electrical supply, if the current is too large.
16. the rate at which energy is transferred.
17. a current that always flows in the same direction.
18. a magnet made by passing electricity through a coil of wire.
20. this safety wire connects the metal case of an appliance.

2. the force that pushes things away from each other.
4. Materials that are attracted to a magnet.
5. The unit of electrical energy.
8. The area around a magnet where its magnetic force can be felt.
11. a place where the high voltage electricity from the national grid is reduced by transformers.
13. the unit of power.
15. generating a current in a wire by moving the wire in a magnetic field, or by moving a magnet inside a coil of wire.
19. an object that has a magnetic field and can attract magnetic materials.