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Why are constantan and manganin used for...

Why are constantan and manganin used for making standard resistances ?

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The resistivity of these materials is moderate and almost independent of temperature.
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PRADEEP-ELECTRICITY-(Additional)Short Answer
  1. Why is nichrome used as a heating element ?

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  2. What is the difference between a resistor and resistance ?

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  3. Why are constantan and manganin used for making standard resistances ?

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

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  5. What are superconductors ?

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  6. (a) What is common between charge and mass ? (b) We know that mass v...

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  7. (a) What are two physical quantities to which electric potential is an...

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  8. (a) What do you mean by the term load in an electric circuit ? (b) W...

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  9. (a) Which is more conducting : silver or gold ? (b) Which is a bette...

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  10. (a) Of which material is a fuse-wire made of ? (b) Of which material...

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  11. (a) Whose resistivity increases more with temperature : of an alloy or...

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  12. A wire having a resistance of 18 Omega is cut into three equal parts. ...

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  13. What is the ratio of equivalent resistance of series combination of n ...

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  14. A given wire is stretched to double its length. How will its resistanc...

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  16. (a) When is the pd for all the resistors in a circuit the same and is ...

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  17. (a) How does the current divide itself in a parallel combination of re...

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  18. (a) How is heat produced in a conductor by an electric current ? (b)...

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  19. (a) Are electrons consumed in a electric circuit when a current flows ...

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  20. (a) How does an incandescent bulb work ? (b) Why is the resistance o...

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