Question 1:
Why does the cord of an electric heater not glow while the heating element does?
Answer:
The heating element of an electric heater is a resistor. The amount of heat produced
by it is proportional to its resistance. The resistance of the element of an electric
heater is very high. As current flows through the heating element, it becomes too
hot and glows red. On the other hand, the resistance of the cord is low. It does not
become red when current flows through it.
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