Question 2 Bulbs A, B, and C in the figure below are identical, and all are glow
ID: 1585645 • Letter: Q
Question
Question 2 Bulbs A, B, and C in the figure below are identical, and all are glowing. a) Rank in order, from most to least, the brightnesses of the three bulbs. Explain b) Suppose a wire is connected between points 1 and 2. What happens to bulb A? Does it get brighter, stay the same, get dimmer, or go out? Explain. c) What happens to bulb B? Does it get brighter, stay the same, get dimmer, or go out? Explain. d) What happens to bulb C? Does it get brighter, stay the same, get dimmer, or go out? Explain.Explanation / Answer
a)
Brightness of the each bulb will depend on the amount of heat energy produced by each bulb,
and brightness will be directly proportional to the amount of heat energy produced
Since each bulb are identical, so take R be the resistance of each bulb,
As we know power produced by each bulb = I2R
so, amount of heat energy produced, H = Power * time = I2Rt
since R and t will be same for each bulb , so,
Heat energy H will be directly proportional to I2
Let I be the current flowing through bulb A, then current flowing through bulb B and C will be I/2 as bulb B and C are parallel to each other and combination of B and C is in series wih bulb A
so, Order of brightness will be as Bulb A > Bulb B = Bulb C
b)
As when a wire will be connected between point 1 and 2, then wire will short circuit the bulb B and C and no current will be flow through B and C as current always flow through choosing easy path,
Since the net resistance of the circuit will be lesser than Earlier, so more current will flow through Bulb A, so, Bulb A will glow more brighter
c)
since no current is flowing through bulb B due to short circuit , so it will not glow i.e go out
d)
since no current is flowing through bulb C due to short circuit , so it will not glow i.e go out
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