Electricity Review

2. Signals that consist of rapid pulses of voltage that repeatedly switch the current off and on.
7. Signals that consist of continuously changing voltage in an electric circuit.
9. Electric current that flows in just one direction.
11. Energy derived as a result of movement of electrically charged particles.
13. A circuit that has two loops.
16. A device that measures the flow of current through the circuit.
20. A continuous flow of electric charges.
21. A circuit that consists of one loop.
22. The SI Unit for resistance.
24. Cells that have two electrodes, which are strips of different materials, such as zinc and carbon.
25. The SI Unit for power.
27. Electric current that keeps reversing direction.
28. The purpose of the round prong on a three-prong plug.
29. Any device that converts some of the electricity to other forms of energy.

1. A switch that automatically interrupts a circuit if too much current flows through it.
3. A solid crystal, consisting mainly of silicon.
4. Often the voltage sources of a simple circuit.
5. A difference in electric potential energy.
6. Materials that have high resistance to electric current.
8. Materials that have virtually no resistance when they are cooled to extremely low temperatures.
10. The rate at which a device changes electric current to another form of energy.
12. Cells that convert the energy in sunlight to electrical energy.
14. An electronic component that consists of a p-type and an n-type semiconductor placed side by side.
15. The SI Unit for voltage.
17. A tiny, flat piece of silicon used in virtually all modern electronic devices to carry out specific tasks.
18. An opposition to the flow of electric charges in an electric current as it travels through matter.
19. A closed loop through which current can flow.
23. Occurs when electric current follows a shorter path than the intended loop of the circuit.
26. Materials that have low resistance to electric current.
27. The SI Unit for current.