1. Electricity and Magnetism
Chapter 7 and 8 Review
Electricity and Magnetism

2. What type of circuit is represented in the following diagram?
a. parallel circuit
b. open circuit
c. series circuit
d. electron circuit

3. Parallel Circuit
Parallel Circuit- 2 or MORE paths

4. Series Circuit
Series Circuit- ONE path

5. Which type of electricity is demonstrated in the picture on the right?
a. static electricity
b. current electricity
c. circuit electricity
d. current circuit

6. Static Electricity
Static Electricity- the accumulation of excess electric charges on an object. Transfer of electrons!

7. Any substance that can attract iron or other magnetic materials is called a/an
a. conductor
b. insulator
c. magnet
d. electron

8. The current that flows in an electric circuit carries ____.
a. chemical energy
b. mechanical energy
c. thermal energy
d.electrical energy

9. A transformer that increases voltage is a ____.
a. resistance transformer
b. step-up transformer
c. step-down transformer
d. voltage motor

10. In the United States, power lines can carry power voltages as high as 750,000 V, a step-down transformer reduces the voltage to ____ for home use.
a. 60 V
b. 120 V
c. 60 Hz
d. 120 Hz

11. A step-down transformer is used to reduce the voltage carried by power lines from 750,000 V to 120 V, so that we can safely use it in our home!

12. A dry-cell battery produces ____.
an alternating current
the same current that a generator produces
a direct current
both direct and alternating current

13. Direct Current (DC)- electrons move from the negative terminal to the positive terminal. ONE direction!

14. Alternating Current (AC)- electrons change direction at regular intervals in a circuit. (Alternating direction)

15. The magnetic force of a magnet is ____.
a. the same at all parts of the magnet
b. strongest at the poles
c. strongest at the center
d. weakest at the poles

16. The magnetic force is STRONGEST at the poles.
North Pole
South Pole

17. V R I In this circuit, how much current flows through the lightbulb?
0.75 amp
1.50 amps
2.0 amps
3.0 amps V R I
1.5 V
0.75 amps
2.0 ohms

18. The bulb will light when a current supplied by at least
one 1.5 V battery is available. Which circuit will fail to light the bulb?

19. In order to create static electricity, two objects must rub together
In order to create static electricity, two objects must rub together. What is the only particle rubbed off of one object and onto the other?
protons
neutrons
electrons

20. Remember….
Electricity is the flow or movement of ELECTRONS from one place to another. e e e e e e e

21. Which items are considered to be safety devices that stop the flow of current during an overload?
batteries and fuses
batteries and circuit breakers
bulbs and circuit breakers
fuses and circuit breakers

22. Fuse & Circuit Breaker Prevents electrical circuits from overheating

23. The strength of a magnetic force in an electromagnet is ________ by increasing the current through the coil.
unaffected
increased
decreased
eliminated

24. The strength of an electromagnet can be INCREASED by
Increasing the current
More turns in coil of wire
Bigger iron core

25. 25. Which pair of magnets would result from cutting this magnet in half?

26. What is the voltage (VOLTS- V) of a circuit that contains 3A of current and a 4-ohm bulb?
b V
c V V R I
12 V
4 Ohms
3 A

27. The voltage of the circuit is 10V
The voltage of the circuit is 10V. What current flows through a 5-watt resistor? P V I
50A
0.5A
c. 2A
5 W
10 V
0.5 A

28. LET’S DO IT AGAIN !!!!!!!