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The filament of an electric bulb starts glowing when current is passed through it, but the wires carrying current do not glow. The reason for this is
The resistance of the filament is more than that of the wires. The filament glows because its high resistance causes it to heat up and emit light when current flows through it. In contrast, the wires have much lower resistance, so they do not heat up significantly and therefore do not glow.
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