# Chapter 6 Electrical Principles

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```					Chapter 6 Electrical Principles                                                           Score

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____    1. A ____ circuit is the conductors that supply power to electrical equipment from the last overcurrent protective
device (fuse or circuit breaker).
a. branch                                           c. parallel
b. feeder                                           d. series
____    2. ____ is the amount of power a circuit is supplying to an electrical device.
a. Amperage                                         c. Resistance
____    3. The ____ across any branch of a parallel circuit is the same as the applied voltage.
a. amperage                                         c. voltage drop
b. resistance                                       d. wattage
____    4. The total resistance of a ____ circuit is always less than the resistance of the lowest value resistor in the
circuit.
a. combination
b. parallel
c. series
____    5. According to Ohm's law, an increase of resistance must cause a proportional decrease of ____.
a. voltage                                          c. resistance
b. wattage                                          d. current
____    6. In parallel circuits, when all resistors are of equal value the total resistance is equal to the value of one
individual resistor ____.
a. multiplied by the number of resistors            c. multiplied by the voltage
b. divided by the number of resistors               d. divided by the voltage
____    7. When using the product over sum method of determining the total resistance of a parallel circuit, you would
____.
a. multiply the total of R(1) times R(2) by the total of R(1) plus R(2)
b. multiply the total of R(1) plus (R2) by the total of R(1) times R(2)
c. divide the total of R(1) times R(2) by the total of R(1) plus R(2)
d. divide the total of R(1) plus R(2) by the total of R(1) times R(2)
____    8. The reciprocal of any number is that number divided ____.
a. by 1                                             c. into 10
b. into 1                                           d. by 10
____    9. The total amount of power in a ____ circuit is equal to the sum of the power used by all the parts.
a. series                                           c. combination
b. parallel                                         d. any of the above
____   10. In a parallel circuit,the amount of current flowing through each resistor is inversely proportional to its ____.
a. amperage                                         c. resistance
b. current                                          d. wattage
____   11. In parallel circuits, the voltage across each branch of the circuit is ____.
a. dependent on the value of the branch resistor
b. dependent on the total current
c. always equal
d. none of the above
____ 12. If four resistors, each with a value of 100 ohms, are connected in parallel, the total resistance of the circuit is
____ ohms.
a. 400                                             c. 50
b. 100                                             d. 25
____ 13. Three resistors, with values of 10 ohms, 20 ohms, and 30 ohms, are connected in parallel and the circuit has a
voltage of 120 volts with an amperage of 2.5 amps. The total current of the 20-ohm branch is ____ amps.
a. 2.5                                             c. 50
b. 6                                               d. 60
____ 14. If a parallel circuit has two resistors with values of 10 ohms and 25 ohms, the total resistance of the circuit is
____ ohms.
a. 250                                             c. 7.14
b. 35                                              d. .14
____ 15. The amount of current leaving the source ____.
a. is always less than the current returning to the source
b. is always more than the current returning to the source
c. must equal the current returning to the source
d. varies with the value of the resistance in the circuit

Completion
Complete each sentence or statement.

16. ____________________ circuits are probably the type of circuit with which most people are familiar, such as
when working with lights and receptacles in homes and office buildings.
17. In a ____________________ circuit, all the lights on a circuit would have to be on in order for any one light
to operate.
18. In a ____________________ circuit, if one light were to burn out, all the lights on the entire circuit would go
out.
19. ____________________ circuits are circuits that have more than one path for current flow.
20. The total ____________________ flow in a parallel circuit is equal to the sum of the currents through all of
the branches of the circuit.
21. When dealing with the concept of load, many students incorrectly believe that an increase of
____________________ results in an increase of load.
22. The total resistance of a ____________________ circuit is the reciprocal of the sum of the reciprocals of the
individual branches.
23. A parallel circuit has three resistors rated at 20 ohms, 40 ohms, and 40 ohms. The total resistance of this
circuit is ____________________ ohms.
Chapter 6 Electrical Principles       Score

MULTIPLE CHOICE

1.   ANS:   A        PTS:   1
2.   ANS:   B        PTS:   1
3.   ANS:   C        PTS:   1
4.   ANS:   B        PTS:   1
5.   ANS:   D        PTS:   1
6.   ANS:   B        PTS:   1
7.   ANS:   C        PTS:   1
8.   ANS:   B        PTS:   1
9.   ANS:   D        PTS:   1
10.   ANS:   C        PTS:   1
11.   ANS:   C        PTS:   1
12.   ANS:   D        PTS:   1
13.   ANS:   A        PTS:   1
14.   ANS:   C        PTS:   1
15.   ANS:   C        PTS:   1

COMPLETION

16. ANS: Parallel

PTS: 1
17. ANS: series

PTS: 1
18. ANS: series

PTS: 1
19. ANS: Parallel

PTS: 1
20. ANS: current

PTS: 1
21. ANS: resistance

PTS: 1
22. ANS: parallel

PTS: 1
23. ANS: 10
PTS: 1

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