Electric Circuits: Master the Fundamentals of Electricity

Question 1

What is the SI unit of electric current?

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Watt

Question 2

According to Ohm's Law, the potential difference across a conductor is

Accepted Answer

Equal to the product of current and resistance

Answer

Proportional to the current flowing through it

Answer

Inversely proportional to the current flowing through it

Answer

Independent of the current flowing through it

Question 3

In a series circuit, the total resistance is

Accepted Answer

Equal to the sum of individual resistances

Answer

Greater than the sum of individual resistances

Answer

Less than the sum of individual resistances

Answer

Independent of individual resistances

Question 4

The power dissipated in a resistor is calculated as

Accepted Answer

Current squared multiplied by resistance

Answer

Voltage squared divided by resistance

Answer

Voltage multiplied by current

Answer

Resistance squared divided by current

Question 5

What is the primary function of a capacitor?

Accepted Answer

Stores electrical charge

Answer

Blocks AC current

Answer

Conducts DC current

Answer

Amplifies voltage

Question 6

AC circuit frequency is expressed in units of

Accepted Answer

Hertz

Answer

Volts

Answer

Ohms

Answer

Watts

Question 7

In a series circuit, how does the total resistance compare to the sum of the individual resistances?

Accepted Answer

Equal to the sum

Answer

Greater than the sum

Answer

Less than the sum

Question 8

In a series circuit, the current is:

Accepted Answer

Constant throughout the circuit

Answer

Variable throughout the circuit

Answer

Zero throughout the circuit

Question 9

The SI unit of resistance is:

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Question 10

Ohm's law states that the current through a conductor between two points is:

Accepted Answer

Directly proportional to the voltage across the two points

Answer

Inversely proportional to the voltage across the two points

Answer

Equal to the voltage across the two points

Question 11

In a parallel circuit, the voltage is:

Accepted Answer

Constant throughout the circuit

Answer

Variable throughout the circuit

Answer

Zero throughout the circuit

Question 12

The power dissipated in a resistor is given by:

Accepted Answer

P = I^2R

Answer

P = IV

Answer

P = VI

Question 13

The energy (U) stored in a capacitor is given by:

Accepted Answer

U = 1/2CV^2

Answer

U = CV

Answer

U = CV^2

Question 14

The SI unit of inductance is:

Accepted Answer

Henry

Answer

Farad

Answer

Ohm

Question 15

In an alternating current (AC) circuit, the power factor is defined as:

Accepted Answer

The ratio of real power to apparent power

Answer

The ratio of apparent power to reactive power

Answer

The ratio of reactive power to real power

Question 16

In an inductor, the voltage that opposes changes in current is known as:

Accepted Answer

Back electromotive force (EMF)

Answer

Voltage drop

Answer

Current gain

Answer

Power loss

Question 17

What is the SI unit of electric current?

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Answer

Watt (W)

Question 18

In a basic electric circuit, how does the current flowing through a resistor relate to the voltage applied?

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

Independent

Answer

Zero

Question 19

Which characteristic is unique to a series circuit?

Accepted Answer

Equal current through all components

Answer

Lower total resistance than the lowest individual resistance

Answer

Total voltage distributed across components

Answer

Independent operation of components

Question 20

Which equation correctly calculates the power dissipated in a resistor?

Accepted Answer

I²/R

Answer

VI

Answer

V²/R

Answer

Power is always zero

Question 21

What primary function does a capacitor perform in an AC circuit?

Accepted Answer

Stores electrical energy

Answer

Blocks direct current (DC)

Answer

Conducts electricity

Answer

Reduces voltage

Question 22

In a parallel circuit, how does the total current compare to the branch currents?

Accepted Answer

Equal to their sum

Answer

Less than their sum

Answer

Greater than their sum

Answer

Zero

Question 23

Which equation represents the energy stored in an inductor?

Accepted Answer

1/2LI²

Answer

LI

Answer

1/2CV²

Answer

Energy is never stored in an inductor

Question 24

Provide specific examples of everyday devices or systems that rely on electric circuits for their operation.

Accepted Answer

Cell phones, computers, and medical imaging equipment

Accepted Answer

Microwave ovens, televisions, and refrigerators

Answer

Microscopes, vacuum cleaners, and bicycles

Answer

Pens, paper clips, and erasers

Question 25

In a series circuit, the current (I) through each component is:

Accepted Answer

Equal to the current flowing through the entire circuit

Answer

Inversely proportional to the resistance (R) of each component

Answer

Directly proportional to the resistance (R) of each component

Answer

Unpredictable and varies randomly

Question 26

The SI unit of electrical resistance is the:

Accepted Answer

Ohm (Ω)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Joule (J)

Question 27

According to Ohm's law, the relationship between current (I), voltage (V), and resistance (R) in a conductor is:

Accepted Answer

I is directly proportional to V

Answer

I is inversely proportional to V

Answer

I is independent of V

Answer

I is proportional to the square of V

Question 28

Which of the following factors does NOT affect the resistance of a conductor?

Accepted Answer

Voltage

Answer

Length

Answer

Material

Answer

Temperature

Question 29

In a parallel circuit, the voltage (V) across each component is:

Accepted Answer

Equal to the voltage across the entire circuit

Answer

Inversely proportional to the resistance (R) of each component

Answer

Directly proportional to the resistance (R) of each component

Answer

Unpredictable and varies randomly

Question 30

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

Accepted Answer

Store electrical energy

Answer

Limit the flow of current

Answer

Amplify voltage signals

Answer

Generate alternating current

Question 31

The unit of electrical power is the:

Accepted Answer

Watt (W)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 32

The main purpose of an inductor in an electrical circuit is to:

Accepted Answer

Store magnetic energy

Answer

Increase the flow of current

Answer

Block the flow of alternating current

Answer

Generate direct current

Question 33

In an AC circuit, how does inductance influence the flow of current?

Accepted Answer

Impedes current flow

Answer

Facilitates current flow

Question 34

How does a change in temperature affect the resistance of a conductor, and what impact does this have on Ohm's law?

Accepted Answer

Resistance changes with temperature, but Ohm's law still applies if the temperature remains constant.

Answer

Resistance increases with increasing temperature, invalidating Ohm's law.

Answer

Resistance decreases with increasing temperature, invalidating Ohm's law.

Answer

Resistance is unaffected by temperature, so Ohm's law always applies.

Question 35

In an electrical circuit, the current (I) is proportional to the voltage (V), while inversely proportional to the resistance (R). Which equation accurately represents this relationship?

Accepted Answer

I = V/R

Answer

V = R/I

Answer

V = I/R

Answer

I = R/V

Question 36

Which electrical component functions by storing electrical energy within an electric field?

Accepted Answer

Capacitor

Answer

Diode

Answer

Resistor

Answer

Inductor

Question 37

In a series circuit, current consistently maintains the same value at all points. This phenomenon occurs because:

Accepted Answer

Charge carriers have only one available path.

Answer

Resistance of each component is equal.

Answer

Power dissipation in each component is identical.

Answer

Voltage drop across components is uniform.

Question 38

Identify the unit used to measure electrical power.

Accepted Answer

Watt

Answer

Volt

Answer

Ampere

Answer

Ohm

Question 39

Which material exhibits good electrical conductivity?

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Rubber

Question 40

A circuit exhibits a power factor of 0.8, indicating that:

Accepted Answer

The circuit consumes both real and reactive power.

Answer

The circuit is purely consuming reactive power.

Answer

The circuit solely consumes real power.