Electric Circuits: Master the Fundamentals of Electricity

Question 1

In a series circuit, the overall 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.

Question 2

Which formula represents Ohm's Law?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

I = V/R

Question 3

In a series circuit, two resistors have resistances of 5 ohms and 10 ohms, respectively. What is the total resistance of the circuit?

Accepted Answer

15 ohms

Answer

5 ohms

Answer

10 ohms

Answer

20 ohms

Question 4

What is the SI unit of capacitance?

Accepted Answer

Farad

Answer

Ampere

Answer

Ohm

Answer

Volt

Question 5

A capacitor stores energy in the form of:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Light energy

Answer

Chemical energy

Question 6

Which method is most effective for identifying a short circuit in a circuit?

Accepted Answer

Measure the current through the suspected short using an ammeter.

Answer

Measure the voltage across the suspected short using a voltmeter.

Answer

Feel for heat by touching the circuit with your finger.

Question 7

In a series circuit, what happens to the total resistance when a new resistor is added?

Accepted Answer

Increases

Answer

Decreases

Answer

Remains the same

Answer

Depends on the value of the new resistor

Question 8

When a 12-volt battery is connected to a 6-ohm resistor, what is the current flowing through the circuit?

Accepted Answer

2 amperes

Answer

6 amperes

Answer

12 amperes

Answer

18 amperes

Question 9

What is the primary purpose of an inductor in an electric circuit?

Accepted Answer

To oppose changes in current

Answer

To increase voltage

Answer

To decrease resistance

Answer

To store energy

Question 10

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

Accepted Answer

To protect against overcurrent

Answer

To regulate voltage

Answer

To store energy

Answer

To act as a conductor

Question 11

In a complex circuit with multiple resistors and voltage sources, how can Kirchhoff's Voltage Law be used to determine the voltage across a specific resistor?

Accepted Answer

Sum the voltages of all circuit elements connected in series with the resistor

Answer

Subtract the voltages of all resistors connected in parallel with the resistor

Answer

Multiply the current flowing through the resistor by its resistance

Answer

Use the power formula (P = IV)

Question 12

What is the standard unit for measuring electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 13

The equation V = IR relates three fundamental electrical quantities. Which law is this?

Accepted Answer

Ohm's Law

Answer

Kirchhoff's Voltage Law

Answer

Kirchhoff's Current Law

Answer

Coulomb's Law

Question 14

In a parallel circuit, the total current is?

Accepted Answer

Equal to the sum of the individual currents

Answer

Greater than the sum of the individual currents

Answer

Less than the sum of the individual currents

Answer

Impossible to determine without circuit details

Question 15

Which energy source converts light energy directly into electrical energy?

Accepted Answer

Solar panel

Answer

Battery

Answer

Hydroelectric generator

Answer

Wind turbine

Question 16

Power dissipated in a resistor can be calculated using which formula?

Accepted Answer

P = I^2 * R

Answer

P = V/R

Answer

P = V * I

Answer

P = R/I

Question 17

Which SI unit measures the flow of electric charge?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Joule

Question 18

In a simple series circuit, what is the relationship between the total resistance and the individual resistances?

Accepted Answer

Equal to the sum of the individual resistances

Answer

Greater than any individual resistance

Answer

Less than the smallest individual resistance

Answer

Zero

Question 19

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

Accepted Answer

Equal to the sum of the currents in each branch

Answer

Greater than the current in any branch

Answer

Less than the current in any branch

Answer

Zero

Question 20

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

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 21

According to Ohm's Law, how is the current through a conductor related to the voltage?

Accepted Answer

Directly proportional to the voltage

Answer

Inversely proportional to the voltage

Answer

Proportional to the square of the voltage

Answer

Independent of the voltage

Question 22

In a simple circuit, how is the power dissipated by a resistor related to the voltage?

Accepted Answer

Proportional to the voltage squared

Answer

Proportional to the current squared

Answer

Proportional to the resistance

Answer

Zero

Question 23

What is the typical voltage supplied by a household power outlet?

Accepted Answer

110 V

Answer

220 V

Answer

440 V

Answer

12 V

Question 24

The SI unit of electric current is:

Accepted Answer

Ampere

Answer

Coulomb

Answer

Volt

Answer

Ohm

Question 25

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the resistances of all the resistors

Answer

Greater than the resistance of any individual resistor

Answer

Less than the resistance of any individual resistor

Answer

Equal to the resistance of the resistor with the highest resistance

Question 26

A device that converts electrical energy into mechanical energy is a:

Accepted Answer

Motor

Answer

Battery

Answer

Resistor

Answer

Capacitor

Question 27

The voltage across a resistor in a circuit is:

Accepted Answer

Directly proportional to the current flowing through it

Answer

Inversely proportional to the current flowing through it

Answer

Unrelated to the current flowing through it

Answer

Proportional to the square of the current flowing through it

Question 28

A closed path through which electric current flows is called a:

Accepted Answer

Circuit

Answer

Conductor

Answer

Insulator

Answer

Resistor

Question 29

The purpose of a fuse in a circuit is to:

Accepted Answer

Prevent excessive current flow

Answer

Store electrical energy

Answer

Regulate voltage

Answer

Increase resistance

Question 30

An ideal conductor has:

Accepted Answer

Zero resistance

Answer

Infinite resistance

Answer

High voltage

Answer

Low current

Question 31

The unit of electrical power is the:

Accepted Answer

Watt

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 32

In an electric circuit, if the voltage across a resistor increases while the resistance stays the same, what happens to the current flowing through the resistor?

Accepted Answer

Increases

Answer

Decreases

Answer

Stays the same

Question 33

In a parallel-plate capacitor with fixed plate area, how does increasing the distance between the plates impact its capacitance?

Accepted Answer

Decreases

Answer

Increases

Answer

No change

Question 34

Which of the following is the unit of electrical resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Siemens

Question 35

In a parallel circuit, the total current flowing through the circuit is:

Accepted Answer

Equal to the sum of the currents flowing through the individual branches

Answer

Greater than the sum of the currents flowing through the individual branches

Answer

Less than the sum of the currents flowing through the individual branches

Question 36

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

Accepted Answer

Voltage

Answer

Length

Answer

Cross-sectional area

Answer

Material

Question 37

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

Accepted Answer

To protect the circuit from overcurrent.

Answer

To provide a constant voltage supply.

Answer

To regulate the flow of current.

Answer

To measure the electrical resistance.

Question 38

Which of the following instruments is used to measure electrical current?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Wattmeter

Answer

Ohmmeter

Question 39

Which of the following circuits has the highest total resistance?

Accepted Answer

Series circuit with two 10 Ohm resistors

Answer

Parallel circuit with two 10 Ohm resistors

Answer

Parallel circuit with a 10 Ohm and a 5 Ohm resistor

Question 40

What is the effect of decreasing the voltage across a resistor while keeping the resistance constant?

Accepted Answer

Current decreases

Answer

Current increases

Answer

Current remains the same

Answer

Resistance decreases

Question 41

Which of the following is a non-renewable energy source?

Accepted Answer

Fossil fuels

Answer

Nuclear energy

Answer

Solar energy

Answer

Wind energy

Question 42

What is the role of a capacitor in an AC circuit, and what is capacitive reactance?

Accepted Answer

Capacitors store energy during one part of the AC cycle and release it during the other, acting like a temporary energy source.

Accepted Answer

Capacitive reactance is a measure of how much a capacitor resists the flow of alternating current.

Answer

Capacitors completely block the flow of alternating current in AC circuits.

Answer

Capacitors have no noticeable effect on AC circuits.

Question 43

In a series circuit, which quantity remains constant throughout the circuit?

Accepted Answer

Current

Answer

Power

Answer

Voltage

Answer

Resistance

Question 44

What is the SI unit of electrical resistance?

Accepted Answer

Ohm

Answer

Watt

Answer

Volt

Answer

Ampere

Question 45

Which factor primarily affects the resistance of a wire?

Accepted Answer

Length

Answer

Power

Answer

Current

Answer

Voltage

Question 46

Which law describes the relationship between voltage, current, and resistance in a circuit?

Accepted Answer

Ohm's Law (V = IR)

Answer

Gauss's Law

Answer

Kirchhoff's Current Law

Question 47

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

Accepted Answer

To protect the circuit from excessive current and prevent damage

Answer

To store energy in the circuit

Answer

To decrease the resistance in the circuit

Answer

To increase the voltage in the circuit

Question 48

Which material has good electrical conductivity?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 49

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

Accepted Answer

To store electrical energy in an electric field

Answer

To increase the current in the circuit

Answer

To decrease the voltage in the circuit

Answer

To block AC current

Question 50

A circuit has a 12 V battery and a 6-ohm resistor. Calculate the current flowing through the resistor.

Accepted Answer

2 amps

Answer

0.5 amps

Answer

6 amps

Answer

24 amps

Question 51

Two resistors with resistances of 10 ohms and 15 ohms are connected in series. What is the total resistance of the circuit?

Accepted Answer

25 ohms

Answer

5 ohms

Answer

15 ohms

Answer

10 ohms

Question 52

Two resistors with resistances of 5 ohms and 10 ohms are connected in parallel. What is the total resistance of the circuit?

Accepted Answer

3.33 ohms

Answer

15 ohms

Answer

5 ohms

Answer

10 ohms

Question 53

A circuit has a 12 V battery, a 4-ohm resistor, and a 6-ohm resistor connected in parallel. What is the total current provided by the battery?

Accepted Answer

3 amps

Answer

1 amp

Answer

6 amps

Answer

2 amps

Question 54

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

Accepted Answer

To protect the circuit from excessive current that could cause damage.

Answer

To decrease the resistance in the circuit.

Answer

To increase the voltage in the circuit.

Answer

To convert AC current to DC current.

Question 55

A light bulb is connected to a battery. If the filament in the light bulb breaks, what is the most likely outcome?

Accepted Answer

The circuit will be broken and the light bulb will not light up.

Answer

The current will decrease and the light bulb will be dimmer.

Answer

The current will increase and the light bulb will be brighter.

Question 56

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

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Glass