topic 2 - energy

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.

Answer 2

False

Question 3

Fill in the blank: The unit of voltage is _____

Answer 3

Volt (V)

Question 4

What is the formula for calculating electrical power?

Answer 4

Power (P) = Voltage (V) × Current (I)

Question 5

What is resistance measured in?

Answer 5

Ohms (Ω)

Question 6

True or False: Ohm’s Law states that V = IR.

Answer 6

True

Question 7

What does a voltmeter measure?

Answer 7

Voltage

Question 8

What does an ammeter measure?

Answer 8

Current

Question 9

Fill in the blank: The total resistance in a series circuit is the _____ of the individual resistances.

Answer 9

sum

Question 10

What is the equivalent resistance of two 4Ω resistors in series?

Answer 10

8Ω

Question 11

How does resistance change in a parallel circuit?

Answer 11

It decreases.

Question 12

What is the equivalent resistance of two 4Ω resistors in parallel?

Answer 12

2Ω

Question 13

True or False: In a parallel circuit, the voltage across each component is the same.

Answer 13

True

Question 14

What is the relationship between current, voltage, and resistance according to Ohm’s Law?

Answer 14

I = V/R

Question 15

What type of circuit allows current to flow in multiple paths?

Answer 15

Parallel circuit

Question 16

What type of circuit has only one path for current to flow?

Answer 16

Series circuit

Question 17

Fill in the blank: A _____ is a device that resists the flow of current.

Answer 17

resistor

Question 18

What is the principle of conservation of charge?

Answer 18

Charge cannot be created or destroyed.

Question 19

True or False: A short circuit occurs when there is a low-resistance path in a circuit.

Answer 19

True

Question 20

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

Answer 20

Current decreases.

Question 21

What is the term for the flow of electric charge?

Answer 21

Current

Question 22

What is alternating current (AC)?

Answer 22

Current that periodically reverses direction.

Question 23

What is direct current (DC)?

Answer 23

Current that flows in one direction only.

Question 24

Fill in the blank: The total power consumed in a circuit is the _____ of the power used by each component.

Answer 24

sum

Question 25

What is the formula for calculating energy used in a circuit?

Answer 25

Energy (E) = Power (P) × Time (t)

Question 26

True or False: The total voltage in a series circuit is the sum of the voltages across each component.

Answer 26

True

Question 27

What happens to the current if the voltage increases in a circuit with constant resistance?

Answer 27

The current increases.

Question 28

What does a circuit breaker do?

Answer 28

It interrupts the flow of current in case of overload.

Question 29

Fill in the blank: The _____ is the path through which electric current flows.

Answer 29

circuit

Question 30

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

Answer 30

To protect the circuit from excessive current.

Question 31

True or False: The resistance of a wire increases with its length.

Answer 31

True

Question 32

What is the term for materials that allow electric charge to flow easily?

Answer 32

Conductors

Question 33

What is the term for materials that resist the flow of electric charge?

Answer 33

Insulators

Question 34

Fill in the blank: A _____ circuit connects components in a way that the current can flow through each component sequentially.

Answer 34

series

Question 35

What device converts electrical energy into mechanical energy?

Answer 35

Motor

Question 36

What device converts mechanical energy into electrical energy?

Answer 36

Generator

Question 37

What happens to the brightness of bulbs in a series circuit if more bulbs are added?

Answer 37

The brightness decreases.

Question 38

What happens to the brightness of bulbs in a parallel circuit if more bulbs are added?

Answer 38

The brightness remains the same.

Question 39

Fill in the blank: The flow of electric charge is often referred to as _____

Answer 39

electric current

Question 40

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

Answer 40

To store electrical energy.

Question 41

True or False: The higher the voltage, the lower the current for a given resistance.

Answer 41

False

Question 42

What is the function of a transformer?

Answer 42

To change the voltage of an alternating current.

Question 43

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

Answer 43

The component that consumes electrical power.

Question 44

What is a short circuit?

Answer 44

An unintended path that allows current to flow with little or no resistance.

Question 45

Fill in the blank: Electric power is measured in _____

Answer 45

watts (W)

Question 46

What is the relationship between power, voltage, and current?

Answer 46

Power (P) = Voltage (V) × Current (I)

Question 47

What is the primary function of an electrical circuit?

Answer 47

To provide a path for electric current to flow.

Question 48

True or False: A battery provides direct current (DC).

Answer 48

True

Question 49

What type of circuit is used in most household wiring?

Answer 49

Parallel circuit