UPSC Exam > UPSC Questions > Consider the following statements. Resistance...
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Consider the following statements.
- Resistance is an essential property in electrical conductivity.
- Resistance involves gain of energy in the form of heat.
- Elimination of resistance can lead to removal of transmission losses in power cables, and massive gains in energy.
How many of the above statements are correct?
- a)Only one
- b)Only two
- c)All three
- d)None
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements. Resistance is an essential property...
Statement Analysis:
Let's analyze each of the given statements to determine their accuracy.
Statement 1: Resistance is an essential property in electrical conductivity.
In electrical circuits, resistance is indeed an essential property. It is the measure of how much a material or component opposes the flow of electric current. Without resistance, there would be no control over the flow of current, making it impossible to use electricity effectively. Therefore, this statement is correct.
Statement 2: Resistance involves gain of energy in the form of heat.
According to Ohm's Law, when an electric current flows through a conductor with resistance, some energy is dissipated in the form of heat. This is known as Joule heating. As a result, the resistance in a circuit leads to the conversion of electrical energy into heat energy. Therefore, this statement is also correct.
Statement 3: Elimination of resistance can lead to removal of transmission losses in power cables, and massive gains in energy.
This statement is not entirely accurate. While it is true that reducing resistance in power cables can help minimize transmission losses and improve energy efficiency, it is practically impossible to eliminate resistance completely. All conductors have some inherent resistance due to their material properties. Additionally, complete elimination of resistance would violate the laws of physics and create perpetual motion, which is not possible.
Conclusion:
Out of the given statements, only the first two are correct. Resistance is indeed an essential property in electrical conductivity, and it results in the gain of energy in the form of heat. However, the elimination of resistance is not possible, making the third statement incorrect.
Therefore, the correct answer is option 'B': Only two of the statements are correct.
Let's analyze each of the given statements to determine their accuracy.
Statement 1: Resistance is an essential property in electrical conductivity.
In electrical circuits, resistance is indeed an essential property. It is the measure of how much a material or component opposes the flow of electric current. Without resistance, there would be no control over the flow of current, making it impossible to use electricity effectively. Therefore, this statement is correct.
Statement 2: Resistance involves gain of energy in the form of heat.
According to Ohm's Law, when an electric current flows through a conductor with resistance, some energy is dissipated in the form of heat. This is known as Joule heating. As a result, the resistance in a circuit leads to the conversion of electrical energy into heat energy. Therefore, this statement is also correct.
Statement 3: Elimination of resistance can lead to removal of transmission losses in power cables, and massive gains in energy.
This statement is not entirely accurate. While it is true that reducing resistance in power cables can help minimize transmission losses and improve energy efficiency, it is practically impossible to eliminate resistance completely. All conductors have some inherent resistance due to their material properties. Additionally, complete elimination of resistance would violate the laws of physics and create perpetual motion, which is not possible.
Conclusion:
Out of the given statements, only the first two are correct. Resistance is indeed an essential property in electrical conductivity, and it results in the gain of energy in the form of heat. However, the elimination of resistance is not possible, making the third statement incorrect.
Therefore, the correct answer is option 'B': Only two of the statements are correct.
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Community Answer
Consider the following statements. Resistance is an essential property...
Statement 2 is incorrect.
- A current is nothing but the movement of charged particles, electrons in most cases, in a particular direction. When the electrons move, they collide, and interact, with other atoms in the material.
- The movement is not entirely smooth, it encounters resistance which, as of now, is an essential property in electrical conductivity. Resistance involves a loss of energy, mostly in the form of heat. Part of the reason why electrical appliances get heated is this resistance.
- Elimination of this resistance can result in super-efficient electrical appliances, removal of transmission losses in power cables, and massive gains in energy.
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Consider the following statements. Resistance is an essential property in electrical conductivity. Resistance involves gain of energy in the form of heat. Elimination of resistance can lead to removal of transmission losses in power cables, and massive gains in energy.How many of the above statements are correct?a)Only oneb)Only twoc)All threed)NoneCorrect answer is option 'B'. Can you explain this answer?
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