Practical Electricity - Pre-lesson Quiz
This 'Practical Electricity - Pre-lesson Quiz' assesses understanding of basic electrical concepts, including the properties of heating elements, power calculations, energy consumption, wiring colors, and safety protocols with fuses. It is designed to enhance practical knowledge and application skills in electricity.
- 1.
Which of the following wires are used in heating elements?
- A.
Steel
- B.
Copper
- C.
Nichrome
- D.
Tungsten
Correct Answer
C. NichromeExplanation
Nichrome wires are commonly used in heating elements because they have a high melting point, high resistivity, and can withstand high temperatures without oxidizing or corroding easily. This makes them ideal for heating applications where a consistent and controlled amount of heat is required. Steel, copper, and tungsten wires are not typically used in heating elements due to their lower resistivity or other limitations.Rate this question:
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- 2.
What is the power generated when a current of 6 A pass through a resistor with a potential difference of 2 V across it?
- A.
0.33 W
- B.
3 W
- C.
8 W
- D.
12 W
Correct Answer
D. 12 WExplanation
The power generated when a current of 6 A passes through a resistor with a potential difference of 2 V across it can be calculated using the formula P = IV, where P is power, I is current, and V is potential difference. Plugging in the given values, we get P = 6 A * 2 V = 12 W. Therefore, the correct answer is 12 W.Rate this question:
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- 3.
What is the amount of energy used when a 500 W television is used 4 hours a day for 30 days?
- A.
60 kWh
- B.
240 kWh
- C.
3750 kWh
- D.
60,000 kWh
Correct Answer
A. 60 kWhExplanation
The amount of energy used can be calculated by multiplying the power of the television (500 W) by the number of hours it is used per day (4 hours) and the number of days it is used (30 days). This gives us a total energy consumption of 60,000 watt-hours or 60 kWh.Rate this question:
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- 4.
What colour is the earth wire?
- A.
Brown
- B.
Blue
- C.
Black
- D.
Green and yellow
Correct Answer
D. Green and yellowExplanation
The earth wire is typically colored green and yellow. This color combination is used to easily identify and distinguish the earth wire from other wires in an electrical system. The purpose of the earth wire is to provide a safe path for electrical current to flow into the ground in case of a fault or electrical surge, preventing electric shock or damage to appliances.Rate this question:
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- 5.
Where must be the fuse be placed?
- A.
At the earth wire
- B.
At the live wire
- C.
At the neutral wire
- D.
None of the above
Correct Answer
B. At the live wireExplanation
The fuse must be placed at the live wire because it acts as a safety device that protects electrical circuits from overloading or short-circuiting. By placing the fuse at the live wire, it can interrupt the flow of current in case of any faults or excessive current, preventing damage to the circuit or appliances and reducing the risk of electrical fires or accidents.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Mar 05, 2010Quiz Created by
Tsiagh
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