Electricity

Question 1

What is the unit of electric current?

Answer 1

Ampere (A)

Question 2

True or False: Voltage is the measure of the potential difference between two points in a circuit.

Answer 2

True

Question 3

Fill in the blank: The formula for calculating power (P) in an electrical circuit is P = _____ × V.

Answer 3

I (Current)

Question 4

What is the unit of resistance?

Answer 4

Ohm (Ω)

Question 5

Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?

Answer 5

Ohm’s Law

Question 6

What is the formula for Ohm’s Law?

Answer 6

V = I × R

Question 7

True or False: A series circuit has multiple paths for current to flow.

Answer 7

False

Question 8

What is the total resistance in a series circuit with three resistors of values 2Ω, 3Ω, and 5Ω?

Answer 8

10Ω

Question 9

In a parallel circuit, if one branch is disconnected, what happens to the rest of the circuit?

Answer 9

The rest of the circuit continues to function.

Question 10

What is the unit of electric charge?

Answer 10

Coulomb (C)

Question 11

Fill in the blank: The energy transferred by an electric charge is called _____ energy.

Answer 11

Electrical

Question 12

What is the formula for calculating energy (E) in an electrical circuit?

Answer 12

E = Q × V

Question 13

True or False: The current is the same at all points in a series circuit.

Answer 13

True

Question 14

What happens to the total current in a parallel circuit as more branches are added?

Answer 14

The total current increases.

Question 15

What is the effect of increasing resistance on current, assuming voltage is constant?

Answer 15

The current decreases.

Question 16

What is the principle behind the operation of a fuse?

Answer 16

A fuse melts and breaks the circuit when the current exceeds a certain level.

Question 17

Fill in the blank: The _____ is the rate at which electrical work is done.

Answer 17

Power

Question 18

What is the standard voltage of mains electricity in the UK?

Answer 18

230V

Question 19

True or False: Insulators allow current to flow easily.

Answer 19

False

Question 20

What do we call materials that allow electric current to flow through them easily?

Answer 20

Conductors

Question 21

What is the term for the flow of electric charge?

Answer 21

Electric current

Question 22

Fill in the blank: The _____ of a circuit is the path through which electricity flows.

Answer 22

Circuit

Question 23

What device is used to measure electric current?

Answer 23

Ammeter

Question 24

What device is used to measure voltage?

Answer 24

Voltmeter

Question 25

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

Answer 25

AC changes direction periodically, while DC flows in one direction.

Question 26

Fill in the blank: The _____ of a circuit can be calculated using the total voltage and total current.

Answer 26

Resistance