Topic 2 - Electricity

Question 1

What is the unit of electric current?

Answer 1

Ampere (A)

Question 2

True or False: Voltage is the measure of electric current flowing in a circuit.

Answer 2

False

Question 3

Fill in the blank: The resistance of a conductor is directly proportional to its ___ and inversely proportional to its cross-sectional area.

Answer 3

length

Question 4

What is the formula for calculating resistance?

Answer 4

Resistance (R) = Voltage (V) / Current (I)

Question 5

What is the unit of voltage?

Answer 5

Volt (V)

Question 6

What does Ohm’s Law state?

Answer 6

The current through a conductor between two points is directly proportional to the voltage across the two points.

Question 7

True or False: A series circuit has more than one path for current to flow.

Answer 7

False

Question 8

What is the total resistance in a series circuit with resistors R1, R2, and R3?

Answer 8

R_total = R1 + R2 + R3

Question 9

What happens to the total current in a parallel circuit?

Answer 9

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

Question 10

Fill in the blank: In a parallel circuit, the voltage across each component is ___ and equal to the source voltage.

Answer 10

the same

Question 11

What is the definition of power in an electrical context?

Answer 11

Power is the rate at which electrical energy is transferred by an electric circuit.

Question 12

What is the formula for electrical power?

Answer 12

Power (P) = Voltage (V) x Current (I)

Question 13

True or False: A higher resistance means less current for a given voltage.

Answer 13

True

Question 14

What is the unit of electrical power?

Answer 14

Watt (W)

Question 15

What does a voltmeter measure?

Answer 15

Voltage (potential difference) across two points.

Question 16

What does an ammeter measure?

Answer 16

Electric current flowing through a circuit.

Question 17

Fill in the blank: The total resistance in a parallel circuit can be calculated using the formula 1/R_total = 1/R1 + 1/R2 + ___.

Answer 17

1/R3

Question 18

What type of circuit is used in household wiring?

Answer 18

Parallel circuit

Question 19

True or False: In a series circuit, if one component fails, the entire circuit stops working.

Answer 19

True

Question 20

What is the effect of increasing the voltage in a circuit with constant resistance?

Answer 20

The current increases.

Question 21

What is a fuse?

Answer 21

A safety device that melts to break the circuit if the current exceeds a certain level.

Question 22

Fill in the blank: A circuit breaker is a device that automatically interrupts the ___ when it detects a fault.

Answer 22

current

Question 23

What is the purpose of insulation in electrical wiring?

Answer 23

To prevent unwanted current flow and protect users from electric shock.

Question 24

What does the term ‘grounding’ refer to in electrical systems?

Answer 24

Connecting parts of a circuit to the earth to prevent electric shock.

Question 25

What is a resistor?

Answer 25

A component that resists the flow of electric current.

Question 26

What is the purpose of a diode?

Answer 26

To allow current to flow in one direction only.

Question 27

Fill in the blank: The flow of electric charge is called ___.

Answer 27

current

Question 28

What is the role of a transformer in an electrical circuit?

Answer 28

To change the voltage level of alternating current.

Question 29

True or False: Direct current (DC) flows in one direction only.

Answer 29

True

Question 30

What is alternating current (AC)?

Answer 30

An electric current that periodically reverses direction.

Question 31

What is the purpose of a circuit diagram?

Answer 31

To visually represent an electrical circuit using symbols.

Question 32

What does the term 'load' refer to in an electrical circuit?

Answer 32

Any device that consumes electrical power.

Question 33

True or False: Electric field strength is defined as the force per unit charge experienced by a positive test charge.

Answer 33

True

Question 34

What is the unit of electric field strength?

Answer 34

Newton per Coulomb (N/C)

Question 35

Fill in the blank: The potential difference between two points is the amount of ___ required to move a unit charge between those points.

Answer 35

work

Question 36

What is the role of a battery in a circuit?

Answer 36

To provide a source of voltage.

Question 37

Fill in the blank: The charge of an electron is approximately ___ Coulombs.

Answer 37

-1.6 x 10^-19