Across
- 3. Something that stops the flow of electricity.
- 4. An example of an excellent insulator.
- 7. The main usage of coal is to heat _________.
- 8. A major disadvantage of using coal.
- 11. An example of a simple circuit device.
- 12. This consists of different parts working together to form a whole.
- 15. An example of a source for an electrical circuit.
- 17. The main output of a fire alarm.
- 18. Nuclear power uses huge reserves of this.
- 19. An example of a conduction material for a circuit.
- 20. When a pathway is closed we say it is __________.
- 22. These carry high voltage current across large distances.
Down
- 1. The input energy of a battery.
- 2. Solar and wind energy cannot be used all the time because they are _____________.
- 5. Electricity needs a continuous path to flow. We call this kind of path an electrical __________.
- 6. The main use for oil in South Africa.
- 9. A bicycle lamp uses this as its source of electricity.
- 10. These change electrical energy into a useful output.
- 13. Using water to make electricity is called __________ electricity.
- 14. The output energy for a fan.
- 16. Cells have a positive and negative __________.
- 21. The main advantage of solar energy.