Is it true that the cord of an electric heater does not glow while the heating element does?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
A low-resistance metallic wire, such as copper or aluminium, is used to make the cable of an electric heater. However, the heating element is formed of an alloy with more resistance than the metals that make up its composition. If

H

it represents the heat produced, then

H = I^{2} Rt

Here, ‘I’ represents current, ‘R’ represents resistance and the ‘t’ represents time. It can be observed that

H

and

R

are directly proportional to each other; hence, the heating element produces more heat since it has higher resistance and glows, whereas the electric heater does not.
Hence, the cord of an electric heater does not glow while the heating element does.

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