AT 121 – Lab 2 – Ohms Law



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. The fuse would blow

B. The circuit would be damaged

C. The component that the fuse is protecting would be damaged

D. Choice B and C

2. What would happen if a 20A fuse were in place of a 10A Fuse?

A. The fuse would blow

B. The circuit would be damaged

C. The component that the fuse is protecting would be damaged

D. 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. 2 Amps

B. 3.5 Amps

C. 5 Amps

D. 10 Amps

4.48A

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. 3

B. 9

C. 15

D. 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. Increase or decrease, depending on the amount of resistance increase

B. Increase

C. Decrease

D. Stay the same

9. If shorted switch terminals caused abnormal, decreased resistance at a switch, the total current flow

in a circuit would...

A. Increase or decrease, depending on the amount of resistance increase

B. Increase

C. Decrease

D. Stays the same

10. In the picture to the right, Short 1 would; (assume Short 1 is only short)

A. Cause the bulb to blow out

B. Keep the bulb on at all times

C. Bypass the fuse

D. Cause the fuse to blow

11. In the picture to the right, Short 2 would; (assume Short 2 is only short)

A. Cause the bulb to blow out

B. Keep the bulb on at all times

C. Bypass the fuse

D. Cause the fuse to blow

12. In the picture to the right, Short 3 would; (assume Short 3 is only short)

A. Cause the bulb to blow out

B. Keep the bulb on at all times

C. Bypass the fuse

D. Cause the fuse to blow

13. The circuit to the right shows:

A. A Series Circuit

B. A Parallel Circuit

C. An open Circuit

D. 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__________

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. A Series Circuit

B. A Parallel Circuit

C. An open Circuit

D. 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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