The Heating Element Of An Electric Heater Glows While The Cord Does Not Glow

The resistance of the element of an electric heater is very high.

The heating element of an electric heater glows while the cord does not glow.

The heating element of an electric heater is a resistor. But the resistance of cord which is usually of copper or aluminum is very low so it does not glow. It becomes too hot and glows red due to heating effect of current. The amount of heat produced by it is proportional to its resistance.

As a result the element becomes very hot and glows whereas the cord does not becomes hot. The heating element of the heater is made up of alloy which has very high resistance so when current flows through the heating element it becomes too hot and glows red. So when current flows through the heating element it becomes too hot and glows red due to heating effect of current. On the other hand the resistance of the cord is low.

But the resistance of cord which is usually of copper or aluminium is very law so it does not glow. The cord of an electric heater is made of thick copper wire and has much lower resistance than the heating element. The heating element of the heater is made up of alloy which has very high resistance so when current flows through the heating element it becomes too hot and glows red. But the resistance of cord which is usually of copper or aluminium is very low so it does not glow.

As current flows through the heating element it becomes too hot and glows red. The heating element of the heater is made up of alloy which has very high resistance.