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A wire connected to a bulb does not glow...

A wire connected to a bulb does not glow, whereas the filament of the bulb gilows when same current flows through them. Why?

Text Solution

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Filament of bulb and supply wires are connected in series. Therefore, the same current flows through them. Since the resistance of connecting wires is negligibly small as compared to the resistance of filament and heat produced due to given current is directly proportional to its resistance (from Joule's law of heating), therefore, the heat produced in the filament is vey large. Hence the bulb glows, but the connecting wirs remain pratically unheated.
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