Why does the heater coil emit light when current passes through it, while the supply wires do not glow?

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Published
28 Jun 2018
Last updated
28 May 2026

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Explanation

The heater coil glows because it has a higher electrical resistance than the supply wires, causing it to heat up and emit light. In contrast, the supply wires have low resistance, so they do not get hot enough to glow.

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