Giancoli's Physics: Principles with Applications, 7th Edition
19
DC Circuits
Change chapter19-1: Emf and Terminal Voltage
19-2: Resistors in Series and Parallel
19-3: Kirchhoff's Rules
19-4: Emfs Combined, Battery Charging
19-5: Capacitors in Series and Parallel
19-6: RC Circuits
19-8: Ammeters and Voltmeters
Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 19
Q
What is the net resistance of the circuit connected to the battery in Fig. 19–50?
Figure 19-50.
A
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COMMENTS
By brian7989 on Thu, 3/30/2017 - 12:06 AM
From step 2 to step 3, how do you know whether you should combine Req2 with the R on the right of Req2 or R that's below Req 2?
By Mr. Dychko on Mon, 4/17/2017 - 1:41 PM
Hi brian7989, thanks for the question. It's important to combine series resistances before parallel resistances. From step 2 to step 3, Req2 needs to be combined wi the R on the right since it's in series with it. It isn't possible to combine Req2 with the resistor below since it's in parallel with the R below, and it's necessary to know the total resistance of each branch when combining them in parallel. We don't yet know the total resistance of the branch containing Req2 until we add it to the R on the right.
Best wishes,
Mr. Dychko
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