Question

Students in a physics lab Use battery and three identical lightbulbs to construct the circuit shown in Figure above_ The brightness of each bulb increases when the current through the bulb incre eases Figure Which bulb, if any, is the brightest? Check the best option: All bulbs have the same brightness Briefly explain your reasoning in terms of current and/or potential difference The students observe the brightness of bulbs A, B, and C The students then add fourth lightbulb D, with a larger resistance than bulbs A, B, and C,as shown in Figure 2 (right): Figure 2 (i) Is bulb now brighter than, dimmer than_ or the same brightness as it was in the circuit in Figure Brighter Dimmer Same brightness Briefly explain your reasoning (ii) Is bulb B now brighter than, dimmer than, or the same brightness as it was in the circuit in Figure Brighter Dimmer Same brightness Briefly explain your reasoning: (c) Bulbs A and C each have resistance 10 _ while bulb D has resistance of 30 0 In the circuit shown in Figure 2, the current through bulb D is measured to be 0.20 A. Calculate the potential difference across bulb

          Students in a physics lab Use battery and three identical lightbulbs to construct the circuit shown in Figure above_ The brightness of each bulb increases when the current through the bulb incre eases
Figure
Which bulb, if any, is the brightest? Check the best option:
All bulbs have the same brightness
Briefly explain your reasoning in terms of current and/or potential difference
The students observe the brightness of bulbs A, B, and C The students then add fourth lightbulb D, with a larger resistance than bulbs A, B, and C,as shown in Figure 2 (right):
Figure 2 (i) Is bulb now brighter than, dimmer than_ or the same brightness as it was in the circuit in Figure
Brighter
Dimmer
Same brightness
Briefly explain your reasoning
(ii) Is bulb B now brighter than, dimmer than, or the same brightness as it was in the circuit in Figure Brighter Dimmer Same brightness Briefly explain your reasoning:
(c) Bulbs A and C each have resistance 10 _ while bulb D has resistance of 30 0 In the circuit shown in Figure 2, the current through bulb D is measured to be 0.20 A. Calculate the potential difference across bulb

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Added by Krystal G.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Saikat Chatterjee

04/15/2022

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However, in a series circuit, all bulbs would have the same brightness because the current is the same throughout the circuit. In a parallel circuit, all bulbs would also have the same brightness because they all receive the full voltage of the battery. (ii) When Show more…

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Students in a physics lab Use battery and three identical lightbulbs to construct the circuit shown in Figure above_ The brightness of each bulb increases when the current through the bulb incre eases Figure Which bulb, if any, is the brightest? Check the best option: All bulbs have the same brightness Briefly explain your reasoning in terms of current and/or potential difference The students observe the brightness of bulbs A, B, and C The students then add fourth lightbulb D, with a larger resistance than bulbs A, B, and C,as shown in Figure 2 (right): Figure 2 (i) Is bulb now brighter than, dimmer than_ or the same brightness as it was in the circuit in Figure Brighter Dimmer Same brightness Briefly explain your reasoning (ii) Is bulb B now brighter than, dimmer than, or the same brightness as it was in the circuit in Figure Brighter Dimmer Same brightness Briefly explain your reasoning: (c) Bulbs A and C each have resistance 10 _ while bulb D has resistance of 30 0 In the circuit shown in Figure 2, the current through bulb D is measured to be 0.20 A. Calculate the potential difference across bulb

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00:01 So in this question we have these two circuits.

00:04 So in the first case, as you can see, all the bulbs are in series.

00:10 All the bulbs are in series.

00:17 So same amount of current flows through each of the, through each bulb.

00:38 That's why there will be all the brightness of the all the bulbs will be same.

00:45 So brightness will be same for all the bulbs.

00:47 Same amount of parent is flowing, see brightness is same for all the body.

01:02 This is for the first case, okay, the circuit for the first one, this one.

01:07 Now in the second case we are adding another bulb in parallel with b and it is having a resistance greater than the resistances of a b and c.

01:18 Actually in this case what is happening actually? so as we are adding the bulb in parallel, that it is a resistance greater than the resistance of a, b and c.

01:25 Equivalent resistance of the circuit is decreased from the previous case because we know that in case of parallel combination in case of parallel combination equivalent resistance resistance is less than the least resistance in the combination okay so as you can see if let's say the resistances are r r in the first case so in the first case, the equivalent resistance was 3r, r plus r plus r.

02:33 Now the equivalent resistance is r plus r for a and c, and for parallel combination bd, now the equivalent resistance rp is less than r because now this rp is less than r.

02:52 So actually the equivalent resistance will be less.

02:57 That means the current will be higher to a.

03:00 So, a will be brighter.

03:04 So in the next, for the second case, a will be brighter.

03:14 Okay, as the current is greater now.

03:18 Okay, thank you.

03:22 Now in the next part, you can see that as in the second circuit, the total current has increased.

03:31 So that means now the potential drop across a and c is greater than the previous case...

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