Why do the wires connecting an electric heater to the mains not glow whoch its heating elemnts does?
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An electric heater works on the principle of Joule’s heating. The heat developed is given by,
H = i2Rt where, i is the current through the circuit, R is the resistance and t is the time for which the current flows.
The connecting wires of an electric heater have negligible resistance. So, the heat developed in the connecting wires is also negligible. The heating element or the coil has high resistance, so, heat is developed in this coil of the heater.
H = i2Rt where, i is the current through the circuit, R is the resistance and t is the time for which the current flows.
The connecting wires of an electric heater have negligible resistance. So, the heat developed in the connecting wires is also negligible. The heating element or the coil has high resistance, so, heat is developed in this coil of the heater.
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