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Electrical Applications Practice Test

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Three resistors (100Ω, 470Ω, and 330Ω) are connected in series. What is the total resistance?

a)

930Ω

b)

470Ω

c)

900Ω

d)

133.3Ω

2.

Use Ohm’s Law to calculate: A 24V battery is connected to a circuit with a resistance of 600Ω. What is the current?

a)

40A

b)

0.04A

c)

2.5A

d)

144A

3.

Which of the following best describes the function of a capacitor?

a)

Amplifies electrical signals

b)

Converts AC to DC

c)

Stores and releases electrical energy

d)

Measures voltage drop

4.

What color bands would represent a 2200Ω resistor with 5% tolerance?

a)

Red, Red, Black, Gold

b)

Red, Red, Red, Gold

c)

Red, Red, Brown, Silver

d)

Red, Black, Red, Gold

5.

Which component is polarized, meaning it must be installed in a specific direction?

a)

Resistor

b)

Inductor

c)

Diode

d)

Transformer

6.

In a series circuit, if one component fails, what happens to the entire circuit?

a)

Voltage increases

b)

Resistance drops to zero

c)

All other components keep working

d)

The entire circuit stops working

7.

What unit is used to measure resistance?

a)

Ohms (Ω)

b)

Ampheres (A)

c)

Watts (W)

d)

Coulombs (C)

8.

What unit is used to measure electrical current?

a)

Ohms (Ω)

b)

Ampheres (A)

c)

Watts (W)

d)

Coulombs (C)

9.

What unit is used to measure the amount of electric charge?

a)

Ohms (Ω)

b)

Watts (W)

c)

Coulombs (C)

d)

Farads (F)

10.

A circuit has a resistance of 12Ω and current of 3A. What is the voltage across the circuit?

a)

36mV

b)

36V

c)

4V

d)

15V

11.

What type of circuit allows current to flow through multiple branches?

a)

Series

b)

Parallel

c)

Direct

d)

Linear

12.

Which of the following would increase resistance in a copper wire?

a)

Shortening the wire

b)

Cooling the wire

c)

Making the wire thinner

d)

Using a larger diameter

13.

What does AC stand for in electrical terms?

a)

Active Circuit

b)

Alternating Current

c)

Applied Conductor

d)

Automatic Control

14.

What is the total resistance when two 6Ω resistors are connected in parallel?

a)

12Ω

b)

3Ω

c)

0.33Ω

d)

6Ω

15.

Which device protects a circuit by breaking the connection when current gets too high?

a)

Diode

b)

Capacitor

c)

Fuse

d)

Resistor

16.

Which of the following is the best conductor of electricity?

a)

Copper

b)

Rubber

c)

Glass

d)

Steel

17.

Which of the following components stores energy in a magnetic field?

a)

Capacitor

b)

Inductor

c)

Resistor

d)

Diode

18.

Which of the following circuits will have the least resistance?

a)

Series circuit with three 100Ω resistors

b)

Parallel circuit with three 100Ω resistors

c)

Series circuit with two 470Ω resistors

d)

One 470Ω resistor by itself

19.

What is the main function of a resistor in a circuit?

a)

Generate voltage

b)

Limit current

c)

Store energy

d)

Measure power

20.

If a light bulb requires 0.5A of current and the power source is 120V, what is the resistance of the bulb?

a)

60Ω

b)

120.5Ω

c)

240Ω

d)

0.004Ω

21.

Which of the following is true about parallel circuits?

a)

All components share the same current

b)

Each component receives full voltage

c)

Removing one branch increases total current

d)

Voltage is divided among each component

22.

A multimeter can be used to measure which of the following?

a)

Resistance

b)

Voltage

c)

Current

d)

All of the above

23.

Which of these materials would be best for insulating a wire?

a)

Aluminum

b)

Iron

c)

Plastic

d)

Graphite

24.

If a circuit has 0.25A of current and 60Ω of resistance, what is the voltage across it?

a)

150V

b)

240V

c)

15V

d)

0.004V

25.

What happens to the current in a circuit if resistance increases while voltage stays the same?

a)

Current increases

b)

Current stays the same

c)

Current decreases

d)

Voltage drops to zero

26.

Which of the following devices converts mechanical energy into electrical energy?

a)

Battery

b)

Generator

c)

Diode

d)

Resistor

27.

What is the resistance of a resistor with color bands: Brown, Black, Orange, Gold?

a)

1kΩ ± 5%

b)

100Ω ± 10%

c)

10kΩ ± 5%

d)

1Ω ± 10%

28.

Which of the following will result in the greatest total resistance in a series circuit?

a)

2Ω + 2Ω + 2Ω

b)

100Ω + 10Ω

c)

47Ω + 47Ω + 47Ω

d)

200Ω + 200Ω

29.

What does a diode do in a circuit?

a)

Stores energy

b)

Regulates voltage

c)

Reduces resistance

d)

Allows current in only one direction

30.

What does the term "short circuit" refer to?

a)

A circuit that doesn’t use resistors

b)

Unintended contact or diversion of a main circuit

c)

A circuit that turns on and off quickly

d)

A series circuit with only two components

31.

Scenario: You are designing a circuit to power a small speaker. The speaker requires 9V and draws 0.3A of current. You only have a 12V power source available.

What component could you add to safely operate the speaker?

a)

Capacitor

b)

Resistor

c)

Inductor

d)

Diode

32.

A flashlight stops working. You open it and find the battery is new, and the bulb is not burnt out. What is the most likely issue?

a)

Too much current

b)

Open circuit caused by a blown fuse

c)

A resistor failure

d)

A loose or corroded connection

33.

Refer to the voltage vs. current graph. What is the resistance of the component being tested?

a)

1.5Ω

b)

2Ω

c)

3Ω

d)

6Ω

34.

[ + ] ——— [Switch] ——— [100Ω Resistor] ——— [LED] ——— [ - ]

The LED is not lighting up. What is the most likely explanation?

a)

The resistor value is too low

b)

The switch is open

c)

The battery has too much voltage

d)

The LED is bypassing the resistor

35.

A line graph shows the power consumption of a fan over time. At 0s the fan draws 2W, at 10s it draws 4W, and at 20s it draws 6W. What can you infer?

a)

The fan is faulty

b)

The fan is gradually spinning faster

c)

The fan is overheating

d)

The voltage is decreasing

36.

What does the pictured symbol represent in a circuit diagram?

a)

Transistor

b)

Fuse

c)

Diode

d)

Capacitor

37.

A student connects a 3V battery to an LED with no resistor, and the LED burns out. What lesson should the student learn?

a)

LEDs need more current

b)

Always use a current-limiting resistor

c)

LEDs only work in reverse

d)

Use larger wires

38.

A robot is powered by a 12V battery and has a motor rated for 6V. What simple solution could protect the motor from damage?

a)

Use a larger or longer wire

b)

Add a voltage divider circuit

c)

Replace the motor with a speaker

d)

Use a capacitor instead of a resistor

39.

What does the pictured symbol represent in a circuit diagram?

a)

Battery

b)

Diode

c)

Capacitor

d)

Resistor

40.

A 9V battery powers two identical resistors in series. If each resistor is 100Ω, what is the current in the circuit?

a)

45A

b)

0.09A

c)

0.045A

d)

4.5A

41.

A student connects a multimeter across a resistor and sees no voltage reading. What is the most likely cause?

a)

The resistor is shorted

b)

The circuit is not powered

c)

The resistor has too much resistance

d)

The multimeter needs to be recalibrated

42.

What does the pictured symbol represent in a circuit diagram?

a)

Battery

b)

Diode

c)

Capacitor

d)

Resistor

43.

Which of the following devices can be used to manually adjust resistance?

a)

Multimeter

b)

Potentiometer

c)

Ammeter

d)

Anemometer

44.

Which of these components automatically opens a circuit when the current exceeds a safe level, then resets afterward?

a)

Fuse

b)

Circuit breaker

c)

Capacitor

d)

Switch

45.

Which component is commonly used to step voltage up or down in an AC circuit?

a)

Capacitor

b)

Diode

c)

Transformer

d)

Inductor

46.

Which of the following best describes the function of a transistor?

a)

A simple resistor

b)

A switch or amplifier for electrical signals

c)

A battery charger

d)

A current detector

47.

What does the pictured symbol represent in a circuit diagram?

a)

Battery

b)

Diode

c)

Capacitor

d)

Resistor

48.

When bulbs are attached in parallel and one goes out, what happens to the others?

a)

They stay lit, but get dimmer.

b)

They stay lit with the same brightness.

c)

They each get brighter by the same amount.

d)

They all go out.

49.

What is a solder made of?

a)

Bronze and copper

b)

Bronze and tin

c)

Tin and lead

d)

Aluminum and lead

50.

Which of the following components work by detecting the presence and intensity of light and converting it into an electrical signal?

a)

Ultrasonic Sound Sensor

b)

Photocell

c)

Diode

d)

Capacitor

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