Two incandescent lamps of 40 and 100 W are rated for the same voltage. Which lamp has more resistance? What is the difference between the filaments of these lamps?
The first lamp has a higher resistance, because the power of a lamp is inversely proportional to its resistance at constant voltage. The filament of the first lamp is thinner. longer and made of a material that has a higher resistivity than the filament of the second lamp.
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