Why does the cord of an electric heater not glow while the heating element does?
Answers
Electric heater doesnt reach the glowing point while any heating element does
The cord of an electric heater does not glow because its resistance is very low so it does not glow. For example, copper and aluminium.
The heating element of the heater is made up of an alloy which has a very high resistance so when current flows through, it becomes hot due to the heating effect of the current.
Note: Voltage=Current*Resistance (V=I*R)
This means that current is directly proportional to the voltage and inversely proportional to the resistance.
An increase in the voltage will increase the current and vice versa when resistance is constant.
If the resistance is increased then the current passing through the circuit decreases as resistance makes it more difficult for the electrons to pass by.
Resistance of a conductor is directly proportional to temperature.
When the temperature increases, the vibration of electrons increase and because of this the probability of collision between electrons increases which creates heat.
(The Note part was the explanation part if you maybe didn't understand. You don't have to right this whole thing in your answer. You can add some. I suggest you add the last paragraph to make your answer better)