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# Some light bulbs have three power settings (not including

ISBN: 9781938168000 42

## Solution for problem 12CQ Chapter 21

College Physics | 1st Edition

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Problem 12CQ

Problem 12CQ

Some light bulbs have three power settings (not including zero), obtained from multiple filaments that are individually switched and wired in parallel. What is the minimum number of filaments needed for three power settings?

Step-by-Step Solution:
Step 1 of 3

Solution  12CQ

As there are three different power setting, so each one have a different voltage supply. Also the filaments of the bulb are individually switch and wired in parallel. So for a particular power setting which has the least voltage supply only one filament is switched.

So that the power required for glowing that particular filament will be minimum.

Also for the second power setting which has a higher voltage supply in comparison to the first power setting, is connected to two filaments in the bulb, so...

Step 2 of 3

Step 3 of 3

##### ISBN: 9781938168000

This full solution covers the following key subjects: filaments, settings, power, obtained, light. This expansive textbook survival guide covers 34 chapters, and 3125 solutions. College Physics was written by and is associated to the ISBN: 9781938168000. Since the solution to 12CQ from 21 chapter was answered, more than 359 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: College Physics , edition: 1. The full step-by-step solution to problem: 12CQ from chapter: 21 was answered by , our top Physics solution expert on 07/07/17, 04:39PM. The answer to “Some light bulbs have three power settings (not including zero), obtained from multiple filaments that are individually switched and wired in parallel. What is the minimum number of filaments needed for three power settings?” is broken down into a number of easy to follow steps, and 34 words.

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