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Science > Electricity > Flashcards

Electricity Flashcards

1
Q

What is the unit of electric current?

A

Ampere

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2
Q

What is Ohm’s Law?

A

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

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3
Q

True or False: Voltage is the same as current.

A

False

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4
Q

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

A

Volt

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5
Q

What is the formula for calculating electrical power?

A

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

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6
Q

What does a resistor do in a circuit?

A

It opposes the flow of electric current.

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7
Q

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

A

B) 5 Ω

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8
Q

What is the SI unit of resistance?

A

Ohm

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9
Q

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

A

True

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10
Q

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

A

the same

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11
Q

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

A

10 Ω

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12
Q

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

A

The total current increases.

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13
Q

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

A

C) Copper

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14
Q

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

A

The current decreases.

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15
Q

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

A

True

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16
Q

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

A

Watts

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17
Q

What is the difference between AC and DC?

A

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

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18
Q

What is a circuit breaker?

A

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

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19
Q

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

A

B) Ohm’s Law

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20
Q

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

A

The device or component that consumes electrical power.

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21
Q

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

A

False

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22
Q

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

A

the same

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23
Q

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

A

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

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24
Q

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

A

C) Plastic

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25
Q

What is the principle of conservation of charge?

A

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

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26
Q

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

A

True

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27
Q

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

28
Q

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

A

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

29
Q

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

A

B) It increases

30
Q

What is a short circuit?

A

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

31
Q

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

32
Q

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

33
Q

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

A

1/R_total = 1/R1 + 1/R2

34
Q

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

A

B) Voltmeter

35
Q

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

36
Q

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

A

Energy = Power × Time

37
Q

What is the definition of resistance?

A

The opposition to the flow of electric current.

38
Q

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

39
Q

What is the purpose of grounding in electrical systems?

A

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

40
Q

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

41
Q

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

42
Q

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

A

B) Parallel

43
Q

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

44
Q

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

A

temperature

45
Q

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

46
Q

What does it mean when a circuit is ‘open’?

A

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

47
Q

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

48
Q

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

49
Q

What is a load resistor?

A

A resistor that consumes power in a circuit.

50
Q

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

51
Q

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

52
Q

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

53
Q

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

54
Q

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

A

The current also doubles.

55
Q

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

56
Q

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

57
Q

What does a watt measure?

58
Q

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

59
Q

What is the primary characteristic of an ideal conductor?

A

It has low resistance.

60
Q

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

61
Q

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

62
Q

What is the function of a battery in a circuit?

A

To provide a source of voltage/potential difference.

63
Q

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

A

A) Ohm’s Law

64
Q

What is the role of an ammeter in a circuit?

A

To measure the current flowing through the circuit.

65
Q

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

Science (4 decks)

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