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Unit One - Basic Electricity
1.
Technician A says that the electron revolves around the center of the atom.
Technician B says that bound electrons are loosely held to the atom.
Who
is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
2. Current flow is measured in
a. volts
b. amperes
c. ohms
d. watts
3. Technician A says that current
flows from negative to positive. Technician
B says that an excess of electrons on one side of a complete circuit will
cause a current to flow. Who is right?
a. A only
b. B only
c. both A and B
d. neither A nor B
4. What material is widely used as a conductor in vehicle electrical systems?
a. copper
b. lead
c. plastic
d. gold
5. All of the following statements about semi-conductors are true EXCEPT:
a. semiconductors are sometimes conductors - sometimes insulators
b. semiconductors change at the atomic level
c. semiconductors are being replaced by mechanical relays
d. semiconductors are used in diodes and transistors
6. A Zener diode will permit current to flow when:
a. amperage reaches a certain level
b. voltage reaches a certain level
c. resistance heat reaches a certain level
d. amperage exceeds voltage
7. All of the transistor current flows through the
a. base
b. collector
c. emitter
d. both B and C
8. An integrated circuit contains many small
a. transistors
b. resistors
c. diodes
d. all of the above
9. The nucleus contains
a. protons and electrons
b. protons and neutrons
c. neutrons and electrons
d. electrons only
10. Another name for voltage is
a. current flow
b. ohms
c. electromotive force
d. opposition to current flow
11. Resistance to the flow of electrons is measured in
a. ohms
b. amps
c. volts
d. watts
12. What is the total resistance of this series circuit?
a. 10 ohms
b. 30 ohms
c. 15 ohms
d. 60 ohms
13. What is the source voltage in this circuit?
a. 10 volts
b. 12 volts
c. 14 volts
d. 24 volts
14. What voltage will the voltmeter indicate?
15. What voltage will the voltmeter indicate?
a. 0 volts
b. 4 volts
c. 6 volts
d. 12 volts
16. What is the current flow through R1 if the resistance of
R2 is 24 ohms and has
a voltage drop of 6 volts?
a. 0.25 amps
b. 4.0 amps
c. 6.0 amps
d. 24 amps
17. What is the value of Vr2 (E2) in this circuit?
a. 6 volts
b. 12 volts
c. 18 volts
d. 24 volts
18. What is the resistance value of R1?
a. 2 ohms
b. 4 ohms
c. 6 ohms
d. 8 ohms
19. What is the total resitance of this parallel circuit?
a. 30 ohms
b. 60 ohms
c. 10 ohms
d. 90 ohms
20. Find the resistance of this parallel circuit:
a. 0.05 ohms
b. 0.19 ohms
c. 5.26 ohms
d. 55.0 ohms
21. Find the current flowing through resistance R3:
a. 0.5 amps
b. 1.0 amps
c. 2.0 amps
d. 5.0 amps
22. Find the total current (At) in this circuit:
a. 2 amps
b. 4 amps
c. 6 amps
d. 12 amps
23. Find the resistance of R1:
a. 6 ohms
b. 7 ohms
c. 2 ohms
d. 4 ohms
24. Find the total resistance of this series-parallel circuit:
a. 15 ohms
b. 20 ohms
c. 30 ohms
d. 60 ohms
25. What is the current flow through R3?
a. 1 amp
b. 2 amps
c. 4 amps
d. 6 amps