Electrical Circuits for Home Maintenance: Learn the Basics

Question 1

Your kitchen light switch has stopped working. What's the first step you should take to troubleshoot the problem?

Accepted Answer

Check if the circuit breaker has tripped or the fuse has blown.

Answer

Replace the light bulb.

Answer

Call an electrician.

Answer

Disassemble the switch to check for loose wires.

Question 2

In an electrical circuit, which unit is used to measure electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 3

Ohm's Law describes the relationship between which three electrical quantities in a circuit?

Accepted Answer

Voltage, Current, Resistance

Answer

Voltage, Power, Resistance

Answer

Current, Power, Resistance

Answer

Voltage, Current, Power

Question 4

What is the primary purpose of a fuse in an electrical system?

Accepted Answer

To prevent electrical fires by interrupting current flow in the event of a fault.

Answer

To regulate the flow of current in the circuit.

Answer

To store electrical energy for later use.

Answer

To insulate electrical wires and components.

Question 5

Which instrument is used to measure electrical voltage?

Accepted Answer

Voltmeter

Answer

Ammeter

Answer

Ohmmeter

Answer

Multimeter

Question 6

Which of the following is NOT a common cause of electrical fires in homes?

Accepted Answer

Properly installed smoke detectors

Answer

Overloaded circuits

Answer

Loose connections

Answer

Faulty appliances

Question 7

Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. Which statement below accurately expresses Ohm's Law?

Accepted Answer

Current equals voltage divided by resistance.

Answer

Voltage equals current multiplied by resistance.

Answer

Resistance equals voltage divided by current.

Answer

Voltage equals current divided by resistance.

Question 8

What unit is used to measure electrical current?

Accepted Answer

Ampere

Answer

Ohm

Answer

Watt

Answer

Volt

Question 9

How does the resistance of a wire change as its length increases?

Accepted Answer

Increases

Answer

Decreases

Answer

Stays the same

Answer

Fluctuates

Question 10

What is the primary function of a fuse in an electrical circuit?

Accepted Answer

To protect against overcurrent

Answer

To conduct electricity

Answer

To store energy

Answer

To insulate wires

Question 11

Which tool is used to measure electrical voltage?

Accepted Answer

Voltmeter

Answer

Ohmmeter

Answer

Ammeter

Answer

Multimeter

Question 12

What formula is used to calculate electrical power?

Accepted Answer

P = I * V

Answer

P = V / I

Answer

P = R * I

Answer

P = I / R

Question 13

What is the purpose of grounding in an electrical system?

Accepted Answer

To provide a safe path for excess electricity

Answer

To improve energy efficiency

Answer

To protect against electromagnetic interference

Answer

To enhance signal quality

Question 14

Which of the following is the SI unit of measurement for electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 15

What is the primary function of a fuse in an electrical circuit?

Accepted Answer

To protect the circuit from excessive current

Answer

To regulate the flow of current

Answer

To store electrical energy

Answer

To convert AC current to DC current

Question 16

What is the fundamental difference between an AC circuit and a DC circuit?

Accepted Answer

AC circuits use alternating current, while DC circuits use direct current

Answer

AC circuits have higher voltage than DC circuits

Answer

DC circuits are more hazardous than AC circuits

Answer

AC circuits are used in homes, while DC circuits are used in vehicles

Question 17

What is the primary purpose of a capacitor in an electrical circuit?

Accepted Answer

To store electrical energy

Answer

To regulate the flow of current

Answer

To protect the circuit from overvoltage

Answer

To convert AC current to DC current

Question 18

In a series circuit, where does the electrical current stay the same?

Accepted Answer

Throughout the entire circuit

Answer

Only at the beginning of the circuit

Answer

Only at the end of the circuit

Question 19

Why is it important to check for voltage drops when you are trying to find a fault in an electrical circuit?

Accepted Answer

Voltage drops can help you find loose connections or points of high resistance in the circuit.

Answer

Voltage drops tell you the total amount of power used by the circuit.

Answer

Voltage drops make sure the voltage at the end of the circuit is the same as at the beginning.

Answer

Voltage drops are only important for AC circuits, not DC circuits.

Question 20

Which unit is used to measure electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 21

In an electrical circuit, the symbol for resistance is:

Accepted Answer

R

Answer

V

Answer

A

Answer

W

Question 22

What is the primary function of a fuse in an electrical circuit?

Accepted Answer

Prevent overloading

Answer

Regulate voltage

Answer

Increase current flow

Answer

Store energy

Question 23

Which type of electrical circuit combines series and parallel circuits?

Accepted Answer

Combination

Answer

Series

Answer

Parallel

Answer

Magnetic

Question 24

What distinguishes alternating current (AC) from direct current (DC)?

Accepted Answer

AC changes direction, while DC flows consistently in one direction

Answer

DC changes direction, while AC flows consistently in one direction

Answer

AC has higher voltage, while DC has lower voltage

Answer

DC has higher voltage, while AC has lower voltage

Question 25

To calculate power in an electrical circuit, which formula is used?

Accepted Answer

P = VI

Answer

P = IR

Answer

P = VR

Answer

P = V/R

Question 26

What is the primary function of a capacitor in an electrical circuit?

Accepted Answer

Store energy

Answer

Regulate voltage

Answer

Increase current flow

Answer

Decrease resistance

Question 27

When troubleshooting an electrical problem, it's advisable to:

Accepted Answer

Begin by verifying the power source

Answer

Replace all components immediately

Answer

Speculate about the potential issue

Answer

Contact an electrician without delay

Question 28

What's the unit of electrical power in the International System of Units (SI)?

Accepted Answer

Watt

Answer

Joule

Answer

Ampere

Answer

Volt

Question 29

What is the primary principle that governs the operation of electric generators?

Accepted Answer

Electromagnetic Induction

Answer

Electrical Conduction

Answer

Electrostatic Induction

Question 30

Which of the following is the unit of electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 31

Which formula is used to calculate electrical power?

Accepted Answer

P = V * I

Answer

P = I * R

Answer

P = V / R

Answer

P = I / V

Question 32

What is the primary function of a fuse in an electrical circuit?

Accepted Answer

To prevent circuit overloading

Answer

To control current flow

Answer

To act as a resistor

Answer

To provide insulation

Question 33

Which tool is used to measure electrical voltage?

Accepted Answer

Voltmeter

Answer

Ammeter

Answer

Ohmmeter

Answer

Wattmeter

Question 34

What is the main purpose of a transformer in an electrical system?

Accepted Answer

To increase or decrease voltage

Answer

To convert AC to DC

Answer

To provide insulation

Answer

To limit current flow

Question 35

What is the difference between an open circuit and a short circuit?

Accepted Answer

Open circuit has infinite resistance, while a short circuit has zero resistance

Answer

Open circuit has zero resistance, while a short circuit has infinite resistance

Answer

Open circuit has high resistance, while a short circuit has low resistance

Answer

Open circuit has low resistance, while a short circuit has high resistance

Question 36

What is the International System of Units (SI) unit for electric current?

Accepted Answer

Ampere

Answer

Watt

Answer

Ohm

Answer

Volt

Question 37

Which term describes the movement of electric charge?

Accepted Answer

Current

Answer

Power

Answer

Voltage

Answer

Resistance

Question 38

What is the term for the difference in electrical potential between two points in a circuit?

Accepted Answer

Voltage

Answer

Current

Answer

Power

Answer

Resistance

Question 39

Which factor in a circuit opposes the flow of electric current?

Accepted Answer

Resistance

Answer

Power

Answer

Current

Answer

Voltage

Question 40

According to Ohm's Law, how does current relate to voltage and resistance?

Accepted Answer

Current is directly proportional to voltage and inversely proportional to resistance

Answer

Current is constant regardless of voltage and resistance

Answer

Current is inversely proportional to voltage and directly proportional to resistance

Question 41

A circuit where electricity flows in only one direction is known as a:

Accepted Answer

DC circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

AC circuit

Question 42

In a parallel circuit, what happens to the current as it passes through different branches?

Accepted Answer

Current is divided between the branches

Answer

Current is reversed in all branches

Answer

Current is zero in all branches

Answer

Current is the same in all branches

Question 43

In a series circuit, what is the relationship between voltage and the components in the circuit?

Accepted Answer

Voltage is the same across all components

Answer

Voltage is zero across all components

Answer

Voltage is reversed across all components

Answer

Voltage is divided between the components

Question 44

When troubleshooting an electrical circuit, what is the primary goal?

Accepted Answer

Identifying the source of the fault

Answer

Ignoring the fault

Answer

Replacing all components

Question 45

What is the term for the force that drives electrons through a circuit?

Accepted Answer

Voltage

Answer

Resistance

Answer

Current

Answer

Power

Question 46

In which unit is electrical current measured?

Accepted Answer

Amperes

Answer

Ohms

Answer

Volts

Answer

Watts

Question 47

Which formula expresses the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit?

Accepted Answer

V = I × R

Answer

R = V / I

Answer

I = V × R

Question 48

Which of the following materials allows electricity to pass through it easily?

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Question 49

What is the primary purpose of a fuse in an electrical circuit?

Accepted Answer

To prevent damage by breaking the circuit in the event of a fault

Answer

To regulate the flow of current

Answer

To store electrical energy

Question 50

Describe the difference between an open circuit and a short circuit.

Accepted Answer

In an open circuit, the current cannot flow, while in a short circuit, the current flows excessively.

Answer

In a short circuit, the current does not flow; in an open circuit, the current flows excessively.

Answer

In an open circuit, the voltage is high; in a short circuit, the voltage is low.

Question 51

Which formula is used to calculate the total resistance of resistors connected in parallel?

Accepted Answer

1/Rtotal = 1/R1 + 1/R2

Answer

Rtotal = R1 + R2

Answer

Rtotal = R1 - R2

Answer

Rtotal = R1 × R2

Question 52

What is the primary function of a capacitor in an electrical circuit?

Accepted Answer

To store electrical energy

Answer

To regulate the flow of current

Answer

To protect the circuit from overloads

Answer

To generate electricity

Question 53

Which of the following is a crucial safety precaution when working with electricity?

Accepted Answer

Always disconnect the power source before handling electrical components

Answer

Rubber gloves are not necessary when handling electrical components

Answer

It is safe to work on live electrical circuits with proper experience