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Heating Effect of Electric Current

Why nichrome ...

Question

Why nichrome wire is used for making heatng coils in electrical heaters?

A

Nichrome wire is 100 times less resisistive than copper

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B

Nichrome wires do not oxidize quickly.

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C

Nichrome wires are 100 times more resisistive than copper

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D

Copper is not an affordable metal to be used in the heaters.

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Solution

The correct options are
B
Nichrome wires do not oxidize quickly.

C
Nichrome wires are 100 times more resisistive than copper

Nichrome wire cannot be replaced in heaters as other metals will quickly oxidize and degrade at elevated emperatures. Nichrome being 100 times more resisistive than copper produces good amount of heat when current passes through it.

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Similar questions

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.

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. The heating element of an heating appliance such as electric room heater is made of nichrome alloy while the connecting wire is insulated copper wire.Why ?

Q. If the resistance of a certain copper wire is 1 Ω, then the resistance of a similar nichrome wire will be about:

(a) 25 Ω
(b) 30 Ω
(c) 60 Ω
(d) 45 Ω

Q. Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them.Which wire gets heated up more ? Justify your answer.

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