Practical Electricity - Pre-lesson Quiz

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| By Tsiagh

Tsiagh

Community Contributor

Quizzes Created: 1 | Total Attempts: 291

Questions: 5 | Attempts: 291 | Updated: Mar 20, 2023

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Answer the following 5 questions.

Questions and Answers

1.

Which of the following wires are used in heating elements?
- A.
  
  Steel
- B.
  
  Copper
- C.
  
  Nichrome
- D.
  
  Tungsten
Correct Answer
C. Nichrome

Explanation
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.

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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 W

Explanation
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.

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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 kWh

Explanation
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.

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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 yellow

Explanation
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.

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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 wire

Explanation
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.

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Current Version
Mar 20, 2023

Quiz Edited by
ProProfs Editorial Team
Mar 05, 2010

Quiz Created by
Tsiagh

Practical Electricity - Pre-lesson Quiz

Which of the following wires are used in heating elements?

What is the power generated when a current of 6 A pass through a resistor with a potential difference of 2 V across it?

What is the amount of energy used when a 500 W television is used 4 hours a day for 30 days?

What colour is the earth wire?

Where must be the fuse be placed?