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Why are Constantan and Manganin used for...

Why are Constantan and Manganin used for making standard resistors?

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The resistivity of Constantan and Manganin is moderate and almost independent of temperature.
Hence, these materials are used for making standard resistors.
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KUMAR PRAKASHAN-ELECTRICITY-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions as directed (Miscellaneous):)
  1. Under what conditions is the Ohm.s law applicable?

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  2. Why is Nichrome used as a heating element?

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  3. Why are Constantan and Manganin used for making standard resistors?

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  4. Why is lead-tin alloy used for making a fuse?

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  5. What is the difference between a resistor ~ and resistance?

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  6. What do you mean by the term load in an electric circuit?

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  7. How does the current divide itself in a parallel combination of resist...

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  8. How does the potential difference divide itself in a series combinatio...

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  9. How is heat produced in a conductor by an electric current?

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  10. If a number of bulbs of different wattages are joined in parallel With...

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  11. Which bulb will glow With maximum brightness in case bulbs of differen...

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  12. What can you say about the resistance of an ammeter?

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  13. What can you say about the resistance of a voltmeter?

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  14. How does the resistance of a metallic Wire depend on its temperature?

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  15. Two wires have the same length, same radius but one of them is made of...

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  16. Name a substance whose resistance decreases with temperature.

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  17. Name a substance whose resistance almost remains unchanged With a chan...

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  18. Distinguish between the kilowatt and the kilowatt hour.

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  19. Name two characteristics of a heater coil.

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  20. The power-voltage rating of an electric appliance is 100 W- 250 V What...

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