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A 20 Ω light bulb and a 10 Ω light bulb are placed parallel with one another in a circuit along with a battery. Which among the following is true?

a) The 20 Ω light bulb will have the same voltage drop as the 10 Ω light bulb.

b) Brightness(power dissipation) of both the bulbs is the same.

c) The 20 Ω bulb will be brighter than the 10 Ω bulb.

d) The 10 Ω bulb will be brighter than the 20 Ω bulb.

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Amal Jeeva
Amal JeevaLv10
24 Sep 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Consider the circuit shown, in which three lights, each ofidentical resistance R, are connected in parallel.
For each of the questions the answer has to be one ofthese:
increases
decreases, but not to zero
decreases, to zero
stays the same



a.) What happens to the intensity (brightness) of each bulb whenthe switch is closed?

light 1:
light 2:
light 3:

Explain.


b.) What happens to each of the following currents when the switchis closed?

current through light 1:
current through light 2:
current through light 3:
total current flowing out of battery:

The figure shows the interior of a three-way incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with a four-position switch for selecting different light intensities, with the positions described as follows: (1) off (switches S1 and S2 both open), (2) switch S1 closed, (3) switch S2 closed, and (4) switches S1 and S2 both closed. The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input to the light bulb when (a) only switch S1 is closed, (b) only switch S2 is closed, and (c) both switches are closed? (d) What If? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions?

Figure

Chapter 27, Problem 3P, Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels

Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with a four-position switch for selecting different light intensities, with the positions described as follows: (1) off (switches S1 and S2 both open), (2) switch S1 closed, (3) switch S2 closed, and (4) switches S1 and S2 both closed. 

The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input of the light bulb when

(a) only switch S1 is closed

(b) only switch S2 is closed

(c) both switches are closed

(d) What if? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions?

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