1. Electricity Test Review

2. What causes current to flow? voltage

3. An example of a voltage source is a(n) _____. battery

4. If two wires of the same material have the same thickness but different lengths, the _____ wire will have greater resistance. longer

5. Adding bulbs to a _____ circuit causes all of the bulbs to shine less brightly. series

6. What is the disadvantage of using fuses? They are not reusable

7. In a _____ circuit, there is only one path for the current to take. series

8. What voltage produces a current of 50 amps with a resistance of 20 ohms? 1000 volts

9. The purpose of having circuit breakers or fuses is: prevent an overload in the circuit

10. A type of current that flows in one direction is _____. Direct current

11. When a balloon is charged, it will pick up small pieces of paper that lie within an inch of it. Predict what would happen if the balloon was moved away from the paper by two inches. the strength of the static force would decrease

12. The build-up of charges on an object is called_____. Static Electricity

13. Unlike charges will _____. attract

14. Resistance in circuits is measured in: ohms

15. Using the equation: I=V/R Predict what happens to the current if the resistance is doubled. the current will decrease

16. If a short circuit exists on a line, what is the probably outcome? The electron flow goes around the load so that it doesn’t work.

17. When purchasing a battery, the unit given as volts represents: voltage

18. Electric charges that are the same _____. repel each other

19. What resistance would produce a current of 200 amps and a voltage of 2000 volts? 10 ohms

20. Electrical power plants use _________ current to send electricity long distances. alternating

21. A _________ takes place within a battery to produce a voltage. chemical reaction

22. What is the current produced by 120 volts and a resistance of 50 ohms? 2.4 amps

23. Power companies measure the amount of current used in _______________ units. Kilowatt-hour

24. Electrons flow _______ from the negative end of a voltage source. Negative