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Factors Affecting Resistance & How They Affect

Which of the ...

Question

Which of the two wires of similar dimensions, copper or nichrome, would you use for the electric heater element? Give reasons to justify your answer.

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Solution

Nichrome wire is used for electric heaters because it has a high melting point and high resistivity.
Copper has little resistance, so it does not glow.
Copper melting point is low as compared to nichrome.

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Give two reasons why nichrome alloy is used for making the heating elements of electrical applicances.

Q. Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.

Q. State whether an electric heater will consume more electrical energy or less electrical energy per second when the length of its heating element is reduced. Give reasons for your answer.

Q. Explain the following:
(a) Why is tungsten used almost exclusively for filament of electric lamps?
(b) Why are copper and aluminium wires usually used for electricity transmission?
(c)Why is nichrome alloy used for making elements of electric irons?

Q. Give Scientific reasons.
a. Tungsten metal is used to make a solenoid type coil in an electric bulb.
b. In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.
c. For electric power transmission, copper or aluminium wire is used.
d. In practice the unit kWh is used for the measurement of electrical energy, rather than joule.

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