Light bulb packages will have at least two numbers on them; a power and what the

Question

Light bulb packages will have at least two numbers on them; a power and what the potential difference across the bulb must be so that the bulb has the listed power. You go to the store and purchase two light bulbs. The package for Bulb A says 40 W in a large font with 120 V in a smaller font; the package for Bulb B says 60 W in a large font with 120 V in a smaller font. You then connect the light bulbs as shown below (where the emf is 120 V):

If all bulb properties are temperature independent, which of the following is correct?

Explanation / Answer

Bulb B is brighter, and its power dissipation is 60 W in this circuit

Explanation : Since Power = V^2/R

hence

Ra = 120*120/40 = 360 Ohm

Rb = 120*120/60 = 240 Ohm

Since intensity is inversely proportional to resistance....

Hence the above option....

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