Download B. A Parallel Circuit

AT 121 – Lab 3 – Ohms Law – Part 2 -
ANSWER KEY
Name :__________________________________
Date: ___________________________________
1. What would happen if a 10A fuse were in place of a 20A Fuse?
A.
B.
C.
D.
The fuse would blow
The circuit would be damaged
The component that the fuse is protecting would be damaged
Choice B and C
2. What would happen if a 20A fuse were in place of a 10A Fuse?
A.
B.
C.
D.
The fuse would blow
The circuit would be damaged
The component that the fuse is protecting would be damaged
Choice B and C
3. Find the current flow in the circuit to the right;
If “X” Ohms were =
1 Ohm = _________12__________
2 Ohms = ______6____________
4 Ohms = ______3____________
10 Ohms = _____1.2____________
50 Ohms = ______.24___________
100 Ohms = _____.12___________
4. A technician is installing a 55-Watt driving lamp. The vehicles electrical system drops to 12 volts, what is
a good rating for a fuse the technician should use to protect this circuit?
A.
B.
C.
D.
2 Amps
3.5 Amps
5 Amps
10 Amps
4.48A
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5. Find the current flow in the circuit to the right;
If “X” Volts were =
1 Volt = _______.25__________
2 Volts = ________.5__________
4 Volts = ______1____________
10 Volts = _______2.5__________
50 Volts = ______12.5___________
100 Volts = ______25__________
6. If you had an outlet that was 120 Volts, and could handle a maximum current of 15 A, how many 60 Watt
bulbs could be placed on that circuit? (Hint, find out how much 1 bulb draws in current first.. then solve..)
A.
B.
C.
D.
3
9
15
30
7. Find the voltage in the circuit to the right;
If “X” Ohms were =
1 Ohm = ______5_____________
2 Ohms = ______10____________
4 Ohms = _____20_____________
10 Ohms = _____50____________
50 Ohms = _____250____________
100 Ohms = ____500____________
8. If corroded switch terminals caused abnormal, increased resistance at a switch, the total current flow
in a circuit would...
A.
B.
C.
D.
Increase or decrease, depending on the amount of resistance increase
Increase
Decrease
Stay the same
9. If shorted switch terminals caused abnormal, decreased resistance at a switch, the total current flow
in a circuit would...
A.
B.
C.
D.
Increase or decrease, depending on the amount of resistance increase
Increase
Decrease
Stays the same
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10. In the picture to the right, Short 1 would; (assume Short 1 is only short)
A.
B.
C.
D.
Cause the bulb to blow out
Keep the bulb on at all times
Bypass the fuse
Cause the fuse to blow
11. In the picture to the right, Short 2 would; (assume Short 2 is only short)
A.
B.
C.
D.
Cause the bulb to blow out
Keep the bulb on at all times
Bypass the fuse
Cause the fuse to blow
12. In the picture to the right, Short 3 would; (assume Short 3 is only short)
A.
B.
C.
D.
Cause the bulb to blow out
Keep the bulb on at all times
Bypass the fuse
Cause the fuse to blow
13. The circuit to the right shows:
A.
B.
C.
D.
A Series Circuit
A Parallel Circuit
An open Circuit
A Series Parallel Circuit
14. Find the total resistance in the circuit to the right;
If “X” Ohms were and
If “Y” Ohms were =
A. 1 Ohm
7 Ohms = __________8______________
B. 2 Ohms
3 Ohms = ___________5_____________
C. 4 Ohms
40 Ohms = ___________44____________
D. 10 Ohms
3 Ohms = ____________13__________
E. 50 Ohms
90 Ohms = _________140__________
F. 100 Ohms
8 Ohms = __________108___________
15. Given the above values, find the total current flow
A. ________1.5 __________
B. ______2.4______________ C. ________.2727____________
D. _________.9230_______
E. ________.082____________ F. ___________.111__________
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16. If voltage drop had to be described, which statement best describes it?
A. The sum of all voltage drops must equal the source voltage.
B. The sum of the voltage times the current equals the source voltage.
17. Find the voltage drop of the following components in the circuit to the right;
Find the voltage drop of “X” if “Y” is;
Y = 3 Volts ------ X = ____9______________
Y = 1 Volts ------ X = _____11_____________
Y = 6 Volts ------ X = _______6___________
Y = 11 Volts ------ X = _______1___________
Y = 4 Volts ------- X = ________8_________
18. The circuit to the right shows:
A.
B.
C.
D.
A Series Circuit
A Parallel Circuit
An open Circuit
A Series Parallel Circuit
19. Find the total resistance in the circuit to the right;
If “X” Ohms were and
If “Y” Ohms were =
A. 1 Ohm
7 Ohms = ____.875____________________
B. 2 Ohms
3 Ohms = ____1.2_________________
C. 4 Ohms
40 Ohms = _____3.6364_____________
D. 10 Ohms
3 Ohms = ____2.307_____________
E. 50 Ohms
90 Ohms = ____32.143________________
F. 100 Ohms
8 Ohms = __7.4074______________
20. Given the above values, find the total current flow
A. ___13.714_________
B. ____10________________ C. _____3.299__________
D. ___5.201__________
E. ___.3733______________
F. __________1.62______
22. A technician is installing a sub woofer in a vehicle. The vehicle's amplifier requires a 4-ohm sub. The
sub that the technician must install is 8 ohms. How can the technician their knowledge of series and parallel
circuits to make this work? What resistors would be needed, and how could the system be wired to make
the vehicle win the big stereo contest? 8 ohms in parallel or another 8 ohm sub in parallel
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