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We use alloys for making standard resistors because they have:
  • a)
    low temperature coefficient of resistivity and high specific resistance.
  • b)
    high temperature coefficient of resistivity and low specific resistance.
  • c)
    low temperature coefficient of resistivity and low specific resistance.
  • d)
    high temperature coefficient of resistivity and high specific resistance.
Correct answer is option 'A'. Can you explain this answer?
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We use alloys for making standard resistors because they have:a)low te...
Alloys have low temperature coefficient of resistivity and high specific resistance. If a = low, the value of ‘R’ with temperature will not change much and specific resistance is high, then required length of the wire will be less.
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We use alloys for making standard resistors because they have:a)low te...
Answer:

Introduction:
In the field of electronics, resistors are essential components used to control the flow of electric current. They are designed to have a specific resistance value, which determines the amount of current flowing through them. Resistors are made from various materials, including alloys, due to their advantageous properties.

Alloys for Making Standard Resistors:
The correct answer to why alloys are used for making standard resistors is option 'A' - low temperature coefficient of resistivity and high specific resistance. Let's understand why this is the case:

Low Temperature Coefficient of Resistivity:
The temperature coefficient of resistivity measures how much the resistance of a material changes with temperature. For standard resistors, it is desirable to have a low temperature coefficient of resistivity because it ensures that the resistance remains relatively constant over a wide range of temperatures.

When the temperature coefficient of resistivity is low, the change in resistance with temperature is minimal. This is important for accurately controlling the flow of current through a circuit, as resistors with stable resistance values provide consistent performance. Alloys, such as constantan and manganin, have low temperature coefficients of resistivity, making them ideal for standard resistors.

High Specific Resistance:
Specific resistance, also known as resistivity, is a measure of how strongly a material opposes the flow of electric current. For standard resistors, it is desirable to have a high specific resistance because it allows for the creation of resistors with higher resistance values.

By using alloys with high specific resistance, resistors with higher resistance values can be manufactured. This is essential in circuits where precise control of current flow is required. Alloys like nichrome and constantan have high specific resistance, making them suitable for standard resistors.

Conclusion:
In conclusion, alloys are used for making standard resistors because they possess a low temperature coefficient of resistivity and high specific resistance. These properties ensure that the resistance of the resistor remains stable over a wide range of temperatures and allows for the creation of resistors with higher resistance values. This is important for accurate and reliable control of current flow in electronic circuits.
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Read the following text and answer the following questions on the basis of the same:Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrom e) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.In carbon composition resistors, ______ the ratio of carbon, _____ the overall resistance.

Read the following text and answer the following questions on the basis of the same:Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrom e) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.Wirewound Resistors are made by winding a thin _____ or similar wire on an ____ former in the form of a spiral helix.

Read the following text and answer the following questions on the basis of the same:Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrom e) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.Metal Film Type Resistors are generally made by depositing pure ______, on ______ rod or substrate.

We use alloys for making standard resistors because they have:a)low temperature coefficient of resistivity and high specific resistance.b)high temperature coefficient of resistivity and low specific resistance.c)low temperature coefficient of resistivity and low specific resistance.d)high temperature coefficient of resistivity and high specific resistance.Correct answer is option 'A'. Can you explain this answer?
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We use alloys for making standard resistors because they have:a)low temperature coefficient of resistivity and high specific resistance.b)high temperature coefficient of resistivity and low specific resistance.c)low temperature coefficient of resistivity and low specific resistance.d)high temperature coefficient of resistivity and high specific resistance.Correct answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about We use alloys for making standard resistors because they have:a)low temperature coefficient of resistivity and high specific resistance.b)high temperature coefficient of resistivity and low specific resistance.c)low temperature coefficient of resistivity and low specific resistance.d)high temperature coefficient of resistivity and high specific resistance.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for We use alloys for making standard resistors because they have:a)low temperature coefficient of resistivity and high specific resistance.b)high temperature coefficient of resistivity and low specific resistance.c)low temperature coefficient of resistivity and low specific resistance.d)high temperature coefficient of resistivity and high specific resistance.Correct answer is option 'A'. Can you explain this answer?.
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