What happens inside a light bulb when you plug it into an electrical circuit? Why does the tungsten thread get hot, but the lead wires are not?

When current passes through the spiral of the light bulb, it heats up and at the same time heats up to a temperature of about 3000 ° C. Since the cross-sectional area of the filament is very small and the resistivity of tungsten is almost twice that of aluminum and three times that of copper, its resistance is very high in comparison with the lead wires. Joule-Lenz’s law also explains its greater heating.

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