College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question

Suppose ε = 10.0 V , R1 = 190 Ω , and R2 = 310 Ω . (Figure 1 attached)

Please help me to conceptualize what value of R3 would be selected so the battery supplies 23.5 mA ?

                 

ww
R
Transcribed Image Text:ww R
Expert Solution
Step 1

We know:

In the given circuit, R, and R3 are in parallel
R.R
1
Therefore, the combined resistance will be, R2g
R2+R
1
1
R R
310R3
310 R
or.R,3
310R
190
Total resistance,Rr = R\ + R23*
310 R
Step 2

Then,

Votage
Current, I
Total Re sis tan ce
10
or,I
310 R
190
310 R
10
or,0.0235
58900
190R 310 R
310R3
58900 500 R
10
or
310 R3
0.0235
or,1384.15 11.75R, = 3100 +10 R
R3 980.486
or
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