Electrical Fundamentals: Master the Basics of Electricity

Question 1

How does resistance impact the current flow in a circuit?

Accepted Answer

Resistance reduces current flow.

Answer

Resistance enhances current flow.

Answer

Resistance has no effect on current flow.

Answer

Resistance increases with higher current flow.

Question 2

In a series circuit with a 9V battery, a 3Ω resistor, and a 6Ω resistor, what's the voltage across the 6Ω resistor?

Accepted Answer

6V

Answer

3V

Answer

9V

Answer

15V

Question 3

What is the unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 4

Which formula represents the relationship between voltage (V), current (I), and resistance (R)?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = IV

Answer

V = I/R

Question 5

Which of the following substances is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Plastic

Question 6

What is the SI unit of electrical power?

Accepted Answer

Watt

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 7

Which of the following components is NOT passive?

Accepted Answer

Transistor

Answer

Resistor

Answer

Capacitor

Answer

Diode

Question 8

Which of the following is a measure of the opposition to the flow of electric current?

Accepted Answer

Resistance

Answer

Voltage

Answer

Current

Answer

Power

Question 9

Which formula calculates the power dissipated in a resistor?

Accepted Answer

P = I^2R

Answer

P = VI

Answer

P = V^2/R

Answer

P = V/I

Question 10

What is a series circuit?

Accepted Answer

Components connected end-to-end

Answer

Components connected in parallel

Answer

Components connected in a loop

Answer

Components connected in a bridge

Question 11

What formula calculates the equivalent resistance of two resistors in parallel?

Accepted Answer

1/(R1 + R2)

Answer

R1 + R2

Answer

R1 - R2

Answer

R1 * R2

Question 12

The SI unit of electric potential is:

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Joule

Question 13

Which of the following materials is a conductor?

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Plastic

Question 14

The primary function of a capacitor in an electrical circuit is to:

Accepted Answer

Store electrical energy

Answer

Resist the flow of current

Answer

Amplify signals

Answer

Generate voltage

Question 15

The unit of electrical power is the:

Accepted Answer

Volt-ampere

Answer

Ampere-ohm

Answer

Ohm-volt

Answer

Joule-ampere

Question 16

An electromotive force (EMF) can be generated by a:

Accepted Answer

Battery

Answer

Capacitor

Answer

Resistor

Answer

Inductor

Question 17

The primary function of a diode in an electrical circuit is to:

Accepted Answer

Allow current to flow in only one direction

Answer

Block current flow in both directions

Answer

Amplify signals

Answer

Generate voltage

Question 18

A characteristic of a semiconductor material is that it:

Accepted Answer

Has both conducting and insulating properties

Answer

Has a high resistance

Answer

Has a low resistance

Answer

Is a perfect conductor

Question 19

Explain the importance of electrical power in electrical engineering and how it affects electrical circuit design.

Accepted Answer

Electrical power is a key factor in determining the appropriate size and specifications of circuit components.

Answer

Electrical power is not a crucial consideration in electrical engineering.

Answer

Electrical power can only be determined in alternating current (AC) circuits.

Answer

Electrical power has no bearing on the energy efficiency of electrical circuits.

Question 20

Which SI unit measures electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 21

Which of the following is an active electrical component?

Accepted Answer

Transistor

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 22

What is the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

There is no direct relationship

Question 23

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

Accepted Answer

To store energy

Answer

To resist current flow

Answer

To amplify signals

Answer

To generate voltage

Question 24

Identify the unit of electrical conductance.

Accepted Answer

Siemens

Answer

Ohms

Answer

Farads

Answer

Henrys

Question 25

What is the fundamental difference between AC and DC electricity?

Accepted Answer

AC reverses direction periodically, while DC flows in one direction

Answer

AC has a higher voltage than DC

Answer

DC has a higher current than AC

Answer

AC is used for long-distance transmission, while DC is used for short distances

Question 26

In a series circuit, what is the total resistance?

Accepted Answer

Equal to the sum of the individual resistances

Answer

Greater than the highest individual resistance

Answer

Less than the lowest individual resistance

Question 27

Which of the following units represents electric current in the International System of Units (SI)?

Accepted Answer

Ampere (A)

Answer

Farad (F)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 28

Which of the following materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Plastic

Question 29

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

Accepted Answer

To limit the flow of current

Answer

To protect against short circuits

Answer

To amplify voltage

Answer

To store energy

Question 30

What is the key difference between alternating current (AC) and direct current (DC)?

Accepted Answer

AC reverses direction periodically, while DC flows in one constant direction

Answer

AC has higher voltage than DC

Answer

DC is used for household lighting, while AC is used for industrial machinery

Question 31

When working with electricity, what is a crucial safety precaution to take?

Accepted Answer

Wear insulated gloves and shoes

Answer

Work on live wires without proper protection

Answer

Use wet tools around electrical equipment

Answer

Avoid using a circuit breaker

Question 32

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

Accepted Answer

To store electrical charge and energy

Answer

To block the flow of alternating current

Answer

To provide a constant voltage

Answer

To increase the current flow

Question 33

What is the main purpose of an inductor in an electrical circuit?

Accepted Answer

To store magnetic energy

Answer

To convert AC current to DC current

Answer

To amplify current flow

Answer

To act as a variable resistor

Question 34

In the International System of Units (SI), what is the unit of measurement for electric current?

Accepted Answer

Ampere (A)

Answer

Watt (W)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 35

Which material possesses excellent electrical conductivity and is commonly used in electrical wiring and components?

Accepted Answer

Copper (Cu)

Answer

Wood

Answer

Plastic (PVC)

Question 36

In an alternating current (AC) circuit, what happens to the inductive reactance (XL) when the frequency of the AC signal is increased?

Accepted Answer

XL increases.

Answer

Capacitive reactance (XC) decreases.

Answer

XL decreases.

Answer

XC increases.

Question 37

Which electrical device converts electrical energy into mechanical energy and is used in various applications?

Accepted Answer

Motor

Answer

Capacitor

Answer

Transformer

Answer

Generator

Question 38

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

Accepted Answer

Protecting the circuit from excessive current (overcurrent).

Answer

Regulating the voltage.

Answer

Storing electrical charge.

Answer

Amplifying the electrical signal.

Question 39

Which type of radiation is characterized by oscillating electric and magnetic fields and travels through space?

Accepted Answer

Electromagnetic radiation

Answer

Surface (water) waves

Answer

Gravitational waves

Answer

Acoustic (sound) waves

Question 40

The principle that describes the operation of a transformer is based on:

Accepted Answer

Electromagnetic induction

Answer

Transistor action

Answer

Capacitive coupling

Answer

Rectification

Question 41

Which of the following is the SI unit of electrical resistance?

Accepted Answer

Ohm (Ω)

Answer

Ampere (A)

Answer

Coulomb (C)

Answer

Watt (W)

Question 42

According to Ohm's Law, the current flowing through a resistor is directly proportional to the:

Accepted Answer

Voltage across the resistor

Answer

Length of the resistor

Answer

Area of the resistor

Answer

Resistance of the resistor

Question 43

The unit of capacitance is the:

Accepted Answer

Farad (F)

Answer

Siemen (S)

Answer

Henry (H)

Answer

Tesla (T)

Question 44

The primary purpose of a fuse in an electrical circuit is to:

Accepted Answer

Protect the circuit from excessive current

Answer

Regulate the flow of current

Answer

Store electrical energy

Answer

Provide a path for current to flow

Question 45

In a resistor, the relationship between voltage and current is:

Accepted Answer

Linear

Answer

Logarithmic

Answer

Parabolic

Answer

Exponential

Question 46

The SI unit of energy is the:

Accepted Answer

Joule (J)

Answer

Weber (Wb)

Answer

Coulomb (C)

Answer

Tesla (T)

Question 47

The primary function of a capacitor in an electrical circuit is to:

Accepted Answer

Store electrical energy

Answer

Conduct electrical current

Answer

Generate electrical current

Answer

Block electrical current

Question 48

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

Accepted Answer

Ampere

Answer

Watt

Answer

Ohm

Answer

Volt

Question 49

Which material allows electric current to flow easily?

Accepted Answer

Copper

Answer

Glass

Answer

Plastic

Answer

Wood

Question 50

In a simple electrical circuit, the relationship between voltage (V), current (I), and resistance (R) is described by which equation?

Accepted Answer

V = I * R

Answer

R = I - V

Answer

I = V + R

Answer

V = R / I

Question 51

What is the SI unit for measuring electrical power?

Accepted Answer

Watt

Answer

Ohm

Answer

Ampere

Answer

Volt

Question 52

In a series circuit, the equivalent resistance (Req) is calculated as the:

Accepted Answer

Sum of the individual resistances

Answer

Largest of the individual resistances

Answer

Average of the individual resistances

Answer

Smallest of the individual resistances

Question 53

In a parallel circuit, the equivalent current (Ieq) is calculated as the:

Accepted Answer

Sum of the individual currents

Answer

Largest of the individual currents

Answer

Average of the individual currents

Answer

Smallest of the individual currents

Question 54

Which safety precaution is crucial when working with electrical circuits?

Accepted Answer

Always disconnect the power source before handling the circuit

Answer

Use bare hands to connect wires

Answer

Work with live wires whenever possible