Physics - Electricity

Question 1

What is an electric circuit?

Answer 1

An electric circuit is a closed loop that allows electric current to flow.

Question 2

What are the two main types of electric circuits?

Answer 2

The two main types of electric circuits are series circuits and parallel circuits.

Question 3

In a series circuit, how does the current behave?

Answer 3

In a series circuit, the current is the same through all components.

Question 4

In a parallel circuit, how does the voltage behave?

Answer 4

In a parallel circuit, the voltage across each component is the same.

Question 5

What happens if one component fails in a series circuit?

Answer 5

If one component fails in a series circuit, the entire circuit is interrupted.

Question 6

What happens if one component fails in a parallel circuit?

Answer 6

If one component fails in a parallel circuit, the other components continue to function.

Question 7

Fill in the blank: Current is measured in ______.

Answer 7

Amperes (A).

Question 8

Fill in the blank: Voltage is measured in ______.

Answer 8

Volts (V).

Question 9

What is Ohm’s Law?

Answer 9

Ohm’s Law states that V = I × R, where V is voltage, I is current, and R is resistance.

Question 10

True or False: In a series circuit, the total resistance is the sum of individual resistances.

Answer 10

True.

Question 11

True or False: In a parallel circuit, the total resistance is greater than the smallest resistance.

Answer 11

False.

Question 12

What is the formula for total resistance in a parallel circuit?

Answer 12

1/R_total = 1/R1 + 1/R2 + 1/R3 + …

Question 13

What is a component in an electric circuit?

Answer 13

A component is any device that uses or affects electric current, such as resistors, capacitors, and inductors.

Question 14

What is the function of a resistor?

Answer 14

A resistor limits the flow of electric current in a circuit.

Question 15

What is the function of a capacitor?

Answer 15

A capacitor stores electrical energy temporarily.

Question 16

What is the function of an inductor?

Answer 16

An inductor stores energy in a magnetic field when electric current flows through it.

Question 17

What is the definition of electric power?

Answer 17

Electric power is the rate at which electrical energy is transferred by an electric circuit, measured in watts (W).

Question 18

What is the formula for electric power?

Answer 18

P = V × I, where P is power, V is voltage, and I is current.

Question 19

True or False: Voltage can exist without current.

Answer 19

True.

Question 20

True or False: Current can exist without voltage.

Answer 20

False.

Question 21

In a circuit, what does a switch do?

Answer 21

A switch opens or closes a circuit, allowing or stopping the flow of current.

Question 22

What is the role of a fuse in an electric circuit?

Answer 22

A fuse protects the circuit by breaking the connection if the current exceeds a certain level.

Question 23

What is the difference between AC and DC?

Answer 23

AC (alternating current) changes direction periodically, while DC (direct current) flows in one direction.

Question 24

What is the primary source of electricity in power plants?

Answer 24

The primary sources include fossil fuels, nuclear, and renewable sources like solar and wind.

Question 25

Fill in the blank: The unit of electric charge is the ______.

Answer 25

Coulomb (C).

Question 26

What is Kirchhoff's Voltage Law?

Answer 26

Kirchhoff's Voltage Law states that the sum of the electrical potential differences (voltage) around any closed circuit is zero.

Question 27

What is Kirchhoff's Current Law?

Answer 27

Kirchhoff's Current Law states that the total current entering a junction must equal the total current leaving the junction.

Question 28

What does a voltmeter measure?

Answer 28

A voltmeter measures the voltage across two points in a circuit.

Question 29

What does an ammeter measure?

Answer 29

An ammeter measures the current flowing through a circuit.

Question 30

In a series circuit, how do you calculate the total voltage?

Answer 30

The total voltage is the sum of the voltages across each component.

Question 31

In a parallel circuit, how do you calculate the total current?

Answer 31

The total current is the sum of the currents through each parallel branch.

Question 32

What is the primary advantage of a parallel circuit?

Answer 32

The primary advantage is that if one component fails, the others can still operate.

Question 33

What is the primary disadvantage of a series circuit?

Answer 33

The primary disadvantage is that if one component fails, the entire circuit stops working.

Question 34

What role does a transformer play in an electric circuit?

Answer 34

A transformer changes the voltage level in an AC circuit.

Question 35

What is the purpose of grounding in electrical systems?

Answer 35

Grounding provides a safe path for excess current to flow to the earth, preventing electric shock.

Question 36

What is a short circuit?

Answer 36

A short circuit occurs when there is a low-resistance connection between two points in a circuit, causing excessive current flow.

Question 37

What is the difference between a load and a source in an electric circuit?

Answer 37

A load consumes electrical energy, while a source provides electrical energy.

Question 38

What is the role of a diode in a circuit?

Answer 38

A diode allows current to flow in one direction only.

Question 39

Fill in the blank: The SI unit of resistance is the ______.

Answer 39

Ohm (Ω).