Electricity

Question 1

What is the unit of electric current?

Answer 1

Ampere

Question 2

What is Ohm’s Law?

Answer 2

V = IR, where V is voltage, I is current, and R is resistance.

Question 3

True or False: Voltage is the same as current.

Answer 3

False

Question 4

Fill in the blank: The unit of voltage is _______.

Answer 4

Volt

Question 5

What is the formula for calculating electrical power?

Answer 5

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

Question 6

What does a resistor do in a circuit?

Answer 6

It opposes the flow of electric current.

Question 7

Multiple Choice: What is the resistance of a conductor with a current of 2 A and a voltage of 10 V? A) 2 Ω B) 5 Ω C) 10 Ω D) 20 Ω

Answer 7

B) 5 Ω

Question 8

What is the SI unit of resistance?

Answer 8

Ohm

Question 9

True or False: Series circuits have the same current through all components.

Answer 9

True

Question 10

Fill in the blank: In a parallel circuit, the voltage across each component is _______.

Answer 10

the same

Question 11

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

Answer 11

10 Ω

Question 12

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

Answer 12

The total current increases.

Question 13

Multiple Choice: Which of the following materials is a good conductor? A) Rubber B) Wood C) Copper D) Glass

Answer 13

C) Copper

Question 14

What is the effect of increasing resistance on current in a circuit?

Answer 14

The current decreases.

Question 15

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

Answer 15

True

Question 16

Fill in the blank: Electric power is measured in _______.

Answer 16

Watts

Question 17

What is the difference between AC and DC?

Answer 17

AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.

Question 18

What is a circuit breaker?

Answer 18

A safety device that automatically stops the flow of current in an electrical circuit.

Question 19

Multiple Choice: Which law relates voltage, current, and resistance? A) Faraday’s Law B) Ohm’s Law C) Kirchhoff’s Law D) Newton’s Law

Answer 19

B) Ohm’s Law

Question 20

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

Answer 20

The device or component that consumes electrical power.

Question 21

True or False: A voltmeter is used to measure current.

Answer 21

False

Question 22

Fill in the blank: The total current in a series circuit is _______ through all components.

Answer 22

the same

Question 23

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

Answer 23

To protect the circuit by breaking the connection if the current is too high.

Question 24

Multiple Choice: Which of the following is NOT a conductor? A) Silver B) Aluminum C) Plastic D) Gold

Answer 24

C) Plastic

Question 25

What is the principle of conservation of charge?

Answer 25

Charge can neither be created nor destroyed; it can only be transferred.

Question 26

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

Answer 26

True

Question 27

Fill in the blank: A device that converts electrical energy into mechanical energy is called a _______.

Answer 27

motor

Question 28

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

Answer 28

Power is the product of voltage and current (P = VI).

Question 29

Multiple Choice: What happens to the total resistance in a series circuit when more resistors are added? A) It decreases B) It increases C) It stays the same D) It doubles

Answer 29

B) It increases

Question 30

What is a short circuit?

Answer 30

A low-resistance connection that allows current to take an unintended path.

Question 31

True or False: Electric potential energy is the energy stored due to the position of charged particles.

Answer 31

True

Question 32

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

Answer 32

current

Question 33

What is the formula for calculating the total resistance in a parallel circuit with two resistors?

Answer 33

1/R_total = 1/R1 + 1/R2

Question 34

Multiple Choice: Which instrument is used to measure voltage? A) Ammeter B) Voltmeter C) Ohmmeter D) Wattmeter

Answer 34

B) Voltmeter

Question 35

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

Answer 35

True

Question 36

Fill in the blank: The formula for calculating energy is _______.

Answer 36

Energy = Power × Time

Question 37

What is the definition of resistance?

Answer 37

The opposition to the flow of electric current.

Question 38

Multiple Choice: Which device can convert electrical energy into light? A) Generator B) Transformer C) Bulb D) Resistor

Answer 38

C) Bulb

Question 39

What is the purpose of grounding in electrical systems?

Answer 39

To provide a safe path for excess current to prevent electric shock.

Question 40

True or False: In a parallel circuit, if one component fails, the others continue to work.

Answer 40

True

Question 41

Fill in the blank: The term 'electrical potential difference' is also known as _______.

Answer 41

voltage

Question 42

Multiple Choice: What type of circuit allows multiple paths for current? A) Series B) Parallel C) Open D) Closed

Answer 42

B) Parallel

Question 43

True or False: An ammeter is connected in parallel to measure current.

Answer 43

False

Question 44

Fill in the blank: The resistance of a conductor increases with _______.

Answer 44

temperature

Question 45

Multiple Choice: Which type of current is used in most household outlets? A) AC B) DC C) Both A and B D) None of the above

Answer 45

A) AC

Question 46

What does it mean when a circuit is 'open'?

Answer 46

It means there is a break in the circuit, preventing current from flowing.

Question 47

True or False: The power consumed by a device is independent of the voltage and current.

Answer 47

False

Question 48

Fill in the blank: The total voltage in a closed loop of a circuit is equal to the _______ of the potential drops.

Answer 48

sum

Question 49

What is a load resistor?

Answer 49

A resistor that consumes power in a circuit.

Question 50

Multiple Choice: In a series circuit with a 12 V battery and two equal resistors, what is the voltage across each resistor? A) 6 V B) 12 V C) 24 V D) 3 V

Answer 50

A) 6 V

Question 51

True or False: A potentiometer is used to measure voltage.

Answer 51

True

Question 52

Fill in the blank: The total energy consumed in a circuit is measured in _______.

Answer 52

Joules

Question 53

Multiple Choice: What is the typical voltage of a car battery? A) 6 V B) 12 V C) 24 V D) 48 V

Answer 53

B) 12 V

Question 54

What is the effect of doubling the voltage in a circuit while keeping resistance constant?

Answer 54

The current also doubles.

Question 55

True or False: The energy consumed by a device can be calculated using the formula Energy = Power × Time.

Answer 55

True

Question 56

Fill in the blank: A _______ is a device used to store electrical energy in an electric field.

Answer 56

capacitor

Question 57

What does a watt measure?

Answer 57

Power

Question 58

Multiple Choice: Which of the following is a non-renewable energy source? A) Solar B) Wind C) Coal D) Hydro

Answer 58

C) Coal

Question 59

What is the primary characteristic of an ideal conductor?

Answer 59

It has low resistance.

Question 60

True or False: The total current in a parallel circuit is equal to the sum of the currents through each branch.

Answer 60

True

Question 61

Fill in the blank: A _______ circuit has only one path for current to flow.

Answer 61

series

Question 62

What is the function of a battery in a circuit?

Answer 62

To provide a source of voltage/potential difference.

Question 63

Multiple Choice: Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points? A) Ohm's Law B) Kirchhoff's Law C) Ampere's Law D) Faraday's Law

Answer 63

A) Ohm's Law

Question 64

What is the role of an ammeter in a circuit?

Answer 64

To measure the current flowing through the circuit.

Question 65

True or False: Electric circuits can operate without a power source.

Answer 65

False