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Why are coils of electric toasters and e...

Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal ?

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The resistivity of an alloy is higher than pure metal. Moreover, at high temperatures, the alloys do not melt readilky. Hence, the coils of heating appliances such as electric toasters and electric irons are made of a an alloy rather than a pure metal.
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NCERT-ELECTRICITY-Exercise
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  2. Let the resistance of an electrical component remain constant while th...

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  3. Why are coils of electric toasters and electric irons made of an alloy...

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  4. Use the data in Table 3.1 to answer the following : (a) Which among ...

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  5. Draw a schematic diagram of a circuit consisting of a battery of three...

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  6. Redraw the circuit of Q.12, putting in an ammeter to measure the curre...

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  7. Judge the equivalent resistance when the following are connected in pa...

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  8. An electric lamp of 100 Omega, a toaster of resistance 50 Omega and a ...

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  9. What are the advantages of connecting electrical devices in parallel w...

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  10. How can three resistors of resistances 2 Omega,3 Omega, and 6 Omega be...

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  11. What is : (a) the highest (b) the lowest total resistances that can b...

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  12. Why does the cord of an electric heater not glow while the heating ele...

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  13. Compute the heat generated while transferring 96000 coulombs of charge...

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  14. An electric iron of resistance 20 Omega takes a current of 5 A. Calcul...

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  15. What determines the rate at which energy is delivered by a current ?

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  16. An electric motor takes 5 A from a 220 V line. Determine the power and...

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  17. A piece of wire of resistance R is cut into five equal parts. These pa...

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  18. Which of the following terms does not represent electrical power in a ...

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  19. An electric bulb is rated 220 V and 100 W. When it is operated on 110 ...

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