Revision Quiz On Electricity
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Electricity is an essential resource invented by humanity. Our ' Revision quiz on electricity ' tests your knowledge of the fundamentals of working electrical concepts. The questions are easy to understand and are prepared to pique your curiosity. Please make sure to read all the questions carefully before answering them. You are expected to answer all the questions in the quiz. Your scores will be given after you've attempted all the questions given in the quiz. The quiz can be a great way to prepare for your upcoming exams. Keep learning and have fun!
Questions and Answers
- 1.
The S.I unit of charge is coulomb, C.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the SI unit of charge is indeed coulomb, which is represented by the symbol C. The coulomb is a fundamental unit of electric charge in the International System of Units (SI). It is defined as the amount of electric charge transported by a constant current of one ampere in one second. Therefore, the correct answer is true.Rate this question:
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- 2.
___________ is the rate of flow of charge.
Correct Answer
CurrentExplanation
Current is the rate of flow of charge. It refers to the movement of electric charge through a conductor. In other words, it is the flow of electrons in a circuit. Current is measured in amperes (A) and is represented by the symbol "I". It is an essential concept in understanding and analyzing electrical circuits and is used to calculate power, voltage, and resistance in a circuit.Rate this question:
- 3.
The S.I unit for potential difference is _______
Correct Answer
volt (V)
voltExplanation
The correct answer is "volt (V)". Volt is the SI unit for potential difference, which measures the amount of electric potential energy per unit charge. It represents the amount of work needed to move a unit charge between two points in an electric field.Rate this question:
- 4.
Three identical bulbs are connected in series. If the current passing through the first bulb is 3 A, then the current passing through the second bulb is 2 A and the current passing through the last bulb is 1A.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
In a series circuit, the current remains the same throughout. Therefore, if the current passing through the first bulb is 3 A, then the current passing through the second and last bulb will also be 3 A, not 2 A and 1 A respectively. Hence, the statement is false.Rate this question:
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- 5.
Three bulbs are connected in series. If the potential difference across each bulb is the same, then the resistance of each bulb must also be the same.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When bulbs are connected in series, the same current flows through each bulb. According to Ohm's Law, the potential difference across a resistor is directly proportional to its resistance. Since the potential difference across each bulb is the same, it implies that the resistance of each bulb must also be the same. Therefore, the statement is true.Rate this question:
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- 6.
Three bulbs are connected in parallel. The potential difference across each bulb will be the same. Even if the bulbs have different resistance.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When bulbs are connected in parallel, each bulb has its own branch and receives the same potential difference across it. This is because the potential difference is shared equally among the branches. Therefore, even if the bulbs have different resistance, the potential difference across each bulb will still be the same.Rate this question:
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- 7.
Three bulbs are connected in parallel, if the currect through each bulb is the same, then the resistance of the bulbs must be the same too.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When bulbs are connected in parallel, the voltage across each bulb is the same, which means the current flowing through each bulb is also the same. According to Ohm's Law (V = IR), if the current is the same and the voltage is the same, then the resistance must be the same as well. Therefore, the statement is true.Rate this question:
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- 8.
Three identical bulbs are connected in parallel, if the effective resistance of the circuit is 3 ohms, what is the resistance of each bulb?
- A.
0.3 ohms
- B.
1 ohms
- C.
3 ohms
- D.
9 ohms
Correct Answer
D. 9 ohmsExplanation
When bulbs are connected in parallel, the total resistance of the circuit is calculated by adding the reciprocals of the individual resistances. In this case, the effective resistance is given as 3 ohms. Since the three bulbs are identical, the resistance of each bulb can be calculated by dividing the total resistance by the number of bulbs, which is 3. Therefore, the resistance of each bulb is 9 ohms.Rate this question:
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- 9.
An ammeter has _________ resistance.
Correct Answer
low
negligibleExplanation
The correct answer is low, negligible. An ammeter is a device used to measure electric current in a circuit. It needs to have low resistance in order to minimize the amount of voltage drop across it and to accurately measure the current flowing through the circuit. Negligible resistance means that the ammeter will not significantly affect the current being measured.Rate this question:
- 10.
A voltmeter has _________ resistance.
Correct Answer
highExplanation
A voltmeter has high resistance because it is designed to measure voltage without drawing significant current from the circuit being measured. High resistance ensures that the voltmeter does not interfere with the circuit and accurately measures the voltage across the component or circuit under test.Rate this question:
- 11.
The resistance of an ohmic metal wire does not depend on
- A.
Its length.
- B.
Its material.
- C.
Its cross-sectional area.
- D.
The potential difference supplied across it.
Correct Answer
D. The potential difference supplied across it.Explanation
The resistance of an ohmic metal wire is determined by its length, material, and cross-sectional area. However, the potential difference supplied across the wire does not affect its resistance. This is because resistance is a property inherent to the wire itself and is not influenced by external factors such as the potential difference.Rate this question:
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- 12.
Which of the following statements about electrical power is true?
- A.
Power is the rate at which energy is changed from one form to another.
- B.
The S.I unit of power is Joules.
- C.
Power = Voltage X Current
- D.
Energy X Time = Power
Correct Answer(s)
A. Power is the rate at which energy is changed from one form to another.
C. Power = Voltage X CurrentExplanation
The correct answer states that power is the rate at which energy is changed from one form to another, and that power is equal to voltage multiplied by current. This explanation aligns with the principles of electrical power, as power is indeed the rate at which energy is transformed or converted, and the formula P = VI represents the relationship between power, voltage, and current in electrical systems.Rate this question:
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- 13.
The earth wire is at zero potential.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The earth wire is connected to the ground, which is considered to be at zero potential. This means that any electrical charge or current that flows through the earth wire will be neutralized and dissipated into the ground, preventing any potential harm or damage. Therefore, the statement that the earth wire is at zero potential is true.Rate this question:
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- 14.
The fuse should be connected to the _____ wire.
Correct Answer
liveExplanation
The fuse should be connected to the live wire. This is because the live wire carries the current from the power source to the appliance or device. By connecting the fuse to the live wire, it acts as a safety measure to protect against excessive current flow and prevent damage to the circuit or device.Rate this question:
- 15.
The correct colour of the Live wire is
- A.
Brown
- B.
Green
- C.
Blue
Correct Answer
A. BrownExplanation
The correct color of the Live wire is brown. In electrical wiring, the Live wire carries the current from the power source to the electrical device. The color coding of wires is standardized to ensure safety and consistency. In most countries, including the UK and Europe, the Live wire is typically brown. This color helps electricians and technicians identify and differentiate the Live wire from other wires in the circuit.Rate this question:
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- 16.
The correct colour of the Earth wire is
- A.
Brown
- B.
Yellow and green
- C.
Blue
Correct Answer
B. Yellow and greenExplanation
The correct colour of the Earth wire is yellow and green. This is because the Earth wire is used for grounding electrical systems and providing a safe path for electrical current to flow in the event of a fault. The yellow and green colour is internationally recognized as the standard colour for Earth wires, indicating that it is specifically designated for grounding purposes. Using any other colour for the Earth wire could lead to confusion and potential safety hazards.Rate this question:
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- 17.
Which of the following statements is incorrect?
- A.
The switch of an appliance can be installed at the live wire or the neutral wire.
- B.
Appliances without Earth wire can still function.
- C.
Earth wire connects the body of an appliance to Earth so that the appliance will not become live.
- D.
The potential at the neutral wire is always zero.
Correct Answer
A. The switch of an appliance can be installed at the live wire or the neutral wire.Explanation
The correct answer is that the switch of an appliance can be installed at the live wire or the neutral wire. This statement is incorrect because the switch of an appliance should only be installed at the live wire. The neutral wire is meant to carry the return current back to the source, and it should not be interrupted by a switch. Installing a switch on the neutral wire can create a dangerous situation where the appliance may still be energized even when the switch is turned off.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Aug 18, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 15, 2011Quiz Created by
Angweeling
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