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The cord of an electric oven does not glow while the heating element glows.Why?
Wiki User
∙ 14y ago
The cord is manufactured to have as low a resistance as possible, while the heating element
is intentionally manufactured with a carefully controlled resistance.
The current through the whole loop ... cord plus heater ... is determined by the resistance of the whole loop.
The magnitude of the current 'I' is (E/R) ... E = the utility line voltage, R = resistance of the cord+heater.
But the power dissipated by each individual resistance in the loop is proportional to the resistance
of that section. P = I2R. So the heating element dissipates more power than the low-resistance
line-cord does.
Wiki User
∙ 14y ago
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