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Why are the coils of electric toasters m...

Why are the coils of electric toasters made of an alloy than a pure metal ?

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(i) The resistivity of an alloy in much higher than that of the pure metal.
(ii) An alloy does not oxidise easily even at high temperatures.
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Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?

PRADEEP-ELECTRICITY-(Additional)Very Short Answer
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  2. How does the resistance of a metallic wire depend on its temperature ?

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  3. Two wires are of the same length, same radius, but one of them is of t...

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  6. Which will have a higher resistivity : a conductor or an insulator ?

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  7. Two wires of same material and same length have radii r1 and r2 respec...

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  8. Name a substance whose resistance decrease with temperature.

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  9. Name a substance whose resistance almost remains unchanged by increase...

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  10. Distinguish between kilowatt and kilowatt hour.

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  11. Name two special characteristics of a heater coil.

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  13. Calculate the current through a lamp of 25 W operating at 200 V.

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  16. What is the pd across each resistor in a series circuit ?

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  17. The power rating of an appliance is 100 W-250 V. What does it signify ...

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  18. Why is much less heat generated in long electric cables than in the fi...

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  19. Is Joule heating always desirable ?

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