Self-Test C-2.2: Electrical Circuits

Complete Self-Test C-2.2 and check your answers.

1. What are the four basic components of any circuit?

a.                                                                                                                

b.                                                                                                                

c.                                                                                                                

d.                                                                                                                

2. What is the function of a circuit breaker or fuse?
   1. To help maintain constant current flow within a circuit
   2. To create the polarity needed within a circuit
   3. To provide a path to ground for electricity
   4. To act as a switch that opens in the event of too much current flow
3. What is alternating current?
   1. Current that alternates between amps and ohms
   2. Current that alternates its direction
   3. Current that alternates amperage from high to low
   4. Current that creates alternate paths for current to flow
4. How is the formula for Ohm’s law expressed?
   1. E = I × R
   2. I = E ÷ R
   3. R = E ÷ I
   4. All of the above
5. If a circuit is powered by 120 volts and has a total resistance of 600 ohms, how much current is running through the circuit?
   1. 5 amps
   2. 120 amps
   3. 0.2 amps
   4. 0.5 amps
6. What is the voltage in a circuit that carries 0.5 amps with a resistance of 200 ohms?
   1. 1 volt
   2. 10 volts
   3. 100 volts
   4. 1000 volts
7. Which definition best describes a series circuit?
   1. There is only one path for electricity to flow through.
   2. There is a series of paths for electricity to flow through.
   3. There are between one and three paths for electricity to flow through.
   4. It is electricity flow created through the use of a series of resistors.
8. What is one advantage of using parallel circuits rather than a series circuit?
   1. The ability to use an unlimited number of loads within the circuit
   2. The ability to de-energize one leg of the circuit without affecting the others
   3. The ability to alternate current through the different legs of the circuit
   4. The ability to create different source voltages throughout the circuit
9. What would a three-way switch controlling a hallway light be an example of?
   1. An SPST switch
   2. An SPDT switch
   3. A DPST switch
   4. A DPDT switch
10. What is the term given to a coil of wire into which an iron armature is drawn?
    1. A coil
    2. A fuse
    3. A circuit breaker
    4. A solenoid
11. Which of the following best describes power?
    1. Current flow
    2. Inductive charge
    3. Work performed
    4. Voltage potential
12. Which two factors affect power?
    1. Voltage and amperage
    2. Resistance and capacitance
    3. Magnetism and conduction
    4. Induction and permeability
13. What kind of AC power supply would you expect to find in an industrial setting?
    1. Inductive power
    2. Single-phase power
    3. Three-phase power
    4. Direct current power
14. What voltage potential would you expect to find in a small shop with three-phase power supply?
    1. 120 VAC
    2. 208 VAC
    3. 240 VAC
    4. 775 VAC
15. Which of the following best describes why cities commonly use AC in public infrastructure?
    1. AC provides ideal voltages for battery charging
    2. AC is not commonly used in public infrastructure
    3. AC is ideal for high-intensity carbon arced light sources
    4. AC can be easily stepped up and transmitted over long distances
16. Which of the following statement best describes Kirchhoff’s law when applied to voltage in a series circuit?
    1. The voltage drop depends upon the available current.
    2. Voltage available is equal to voltage drop over entire circuit.
    3. All resistors in a Kirchhoff’s circuit must have the same voltage ratings.
    4. After the last resistor in a circuit, there must be voltage remaining to return to neutral.
17. Which of the following is both a load and a switch?
    1. Relay
    2. Resistor
    3. Capacitor
    4. Transformer
18. Which of the following best describes a transformer that reduces 120 VAC to 24 VACf?
    1. Step-up
    2. Isolation
    3. Capacitive
    4. Step-down
19. Which term best describes two metal plates separated by an insulative material for storage of a charge?
    1. Farad
    2. Ampacity
    3. Capacitor
    4. Transformer

Answer Key: Self-Test C-2.2 is on the other page.