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  • Some light bulbs are connected in parallel to a 120 V source as shown in the figure. Each bulb dissipates an average power of60 W.The circuit has a fuse F that burns out when the current in the cir

Some light bulbs are connected in parallel to a 120 V source as shown in the figure. Each bulb dissipates an average power of60 W.The circuit has a fuse F that burns out when the current in the circuit exceeds or equals 9 A. Determine the largest number of bulbs ofthe following, that can be used in the circuit without burning out the fuse.

Option: 1

9


Option: 2

17


Option: 3

36


Option: 4

34


Answers (1)

best_answer

\text { Current through each bulb }=\frac{60}{120}=0.5 \mathrm{~A} \quad(\because \mathrm{P}=\mathrm{VI})

\therefore \quad \text { For current not exceed or equal to } 9 \mathrm{~A} \text {, maximum number of bulb }= 17

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