Direct Current
Direct Current
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Question 1 |
In a DC circuit, current flows
A | From negative to positive |
B | From positive to negative |
C | Slower if the voltage is reduced in a circuit |
D | Faster if the resistance is increased in the circuit |
Question 2 |
The three components needed in an electrical circuit are the
A | Path, volts, and power |
B | Current, path, and load |
C | Power source, path, and load |
D | Switch, power source, and load |
Question 3 |
On a direct current power source,
A | Black represents negative and green represents positive |
B | Black represents positive and green represents negative |
C | Red represents positive and black represents negative |
D | Red represents negative and black represents positive |
Question 4 |
Increasing the length of the path of an electrical circuit will
A | Decrease the total circuit resistance |
B | Increase the current |
C | Increase resistance |
D | Increase wattage |
Question 5 |
The load in an electrical circuit is used to?
A | Create electrical energy |
B | Convert electrical energy to heat, light, or magnetism |
C | Convert the flow of voltage |
D | Control the wattage of a load |
Question 6 |
A switch in an electrical circuit is used to?
A | Control current to a load |
B | Control the resistance of an electrical load |
C | Control the flow of voltage |
D | Control the wattage of a load |
Question 7 |
When placed in an electrical circuit, an open switch will?
A | Make the path to a load |
B | Break the path to a load |
C | Have no effect on the path to the load |
D | Temporarily interrupt voltage flow |
Question 8 |
When placed in an electrical circuit, a closed switch will?
A | Make the path to a load |
B | Break the path to a load |
C | Have no effect on the path to a load |
D | Temporarily interrupt voltage flow |
Question 9 |
An example of a manually operated switch is a
A | Temperature control |
B | Pressure control |
C | Defrost timer |
D | Toggle switch |
Question 10 |
An example of an automatically operated switch is a
A | Lever type |
B | Push button |
C | High pressure control |
D | Single pole, double throw toggle switch |
Question 11 |
On what type of an electrical circuit can Ohm’s law be used?
A | An inductive circuit |
B | A capacitive circuit |
C | A resistive circuit |
D | An inductive, capacitive, and resistive circuit |
Question 12 |
Which is used to find amperage using Ohm’s law?
A | E = IR |
B | I = E/R |
C | R = E/I |
D | I = RE |
Question 13 |
Which is used to find resistance using Ohm’s law?
A | E = IR |
B | R = EI |
C | R = E/I |
D | I = RE |
Question 14 |
Which is used to find voltage using Ohm’s law?
A | E = IR |
B | E = I/R |
C | R = E/I |
D | I = RE |
Question 15 |
Which is used to find power using Watt’s law?
A | P = E/R |
B | P = EI |
C | P = E2/I |
D | P = E/R |
Question 16 |
Which is used to find power using Watt’s law?
A | P = E/I |
B | P = E2/I |
C | P = I2R |
D | P = E/R |
Question 17 |
When three 15 ohm resistors are connected in series using a 120 volt power source, what is the total amperage of the circuit?
A | 8 amps |
B | 3.2 amps |
C | 2.7 amps |
D | 375 milliamps |
Question 18 |
When two 20 ohm resistors are connected in parallel and the source voltage is 240 volts, what is the total amperage of the circuit?
A | 12 amps |
B | 24 amps |
C | 3 amps |
D | 10 amps |
Question 19 |
When a 24 volt power supply is used in a circuit with 12 ohms of resistance, what is the total power rating of the circuit?
A | 2 watts |
B | 288 watts |
C | 24 watts |
D | 48 watts |
Question 20 |
What is the total resistance of a circuit when a 5 ohm resistor, and a 10 ohm resistor, and a 15 ohm resistor are wired in parallel with each other?
A | 30 |
B | 15 |
C | 4.55 |
D | 2.73 |
Question 21 |
In a series circuit, which of the following is true?
A | Current is the same throughout the circuit |
B | Current increases as loads are added |
C | Resistance decreases as loads are added |
D | Voltage increase as loads are added |
Question 22 |
In a series circuit, which of the following is not true?
A | Resistance decrease as loads are added |
B | Resistance increases as loads are added |
C | Voltage drops across loads wired in series |
D | Current is the same throughout the circuit |
Question 23 |
In a series circuit that is using an electric heater as a load, what would cause an increase in circuit current?
A | A decrease in resistance |
B | An increase in resistance |
C | A decrease in voltage |
D | A burnt contact |
Question 24 |
In a parallel circuit, which would be true?
A | Voltage is the same across each load |
B | Current is always the same across each load |
C | Total resistance increases as loads are added |
D | Voltage increase as loads are added |
Question 25 |
In a parallel circuit, which of the following is not true?
A | Total resistance decrease as loads are added |
B | Voltage is the same across each load |
C | Current decreases as loads are added |
D | Current increase as loads are added |
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