Two lightbulbs designed for 120-V use are rated at 40 W and 60 W. Which light-bulb has the greater filament resistance? Why?
To find: which light bulb has greater filament resistance
Explanation of Solution
For a constant voltage supply (V), the power dissipate in a resistive element is
Resistance of both bulbs are
Since power dissipation is inversely proportional to the resistance, so the 40 W bulb has greater resistance.
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