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Problem: Two bulbs are connected in parallel across a source of emf ℰ = 11.0 V with a negligible internal resistance. One bulb has a resistance of 3.0 Ω , and the other is 3.0 Ω . A resistor R is connected in the circuit in series with the two bulbs. What value of R should be chosen in order to supply each bulb with a voltage of 2.4 V ?For what value of R would the potential difference across each of the bulbs be 2.4 V ? Express your answer in ohms using three significant figures.

FREE Expert Solution

The equivalent resistance of parallel resistors,

1Req=1R1+1R2

Series resistors,

Req=R1+R2

V=IR

The equivalent resistance of the bulbs,

Req=(13+13)-1

Req = 1.5 Ω

R and Req are in series.

RR,Req = 1.5 + R

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Problem Details

Two bulbs are connected in parallel across a source of emf ℰ = 11.0 V with a negligible internal resistance. One bulb has a resistance of 3.0 Ω , and the other is 3.0 Ω . A resistor R is connected in the circuit in series with the two bulbs. What value of R should be chosen in order to supply each bulb with a voltage of 2.4 V ?

For what value of R would the potential difference across each of the bulbs be 2.4 V ? Express your answer in ohms using three significant figures.

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