Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
19
DC Circuits
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19-1: 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 52
Q

Estimate the value of resistances needed to make a variable timer for intermittent windshield wipers: one wipe every 15 s, 8 s, 4 s, 2 s, 1 s. Assume the capacitor used is on the order of 1  μF1 \; \mu \textrm{F}. See Fig. 19–67.

Problem 52.
Figure 19-67.
A
R15=15×106  Ω,R8=8×106  Ω,R4=4×106  ΩR_{15} = 15 \times 10^6 \; \Omega, R_{8} = 8 \times 10^6 \; \Omega, R_4 = 4 \times 10^6 \; \Omega
R2=2×106  Ω,R1=1×106  ΩR_2 = 2\times 10^6 \; \Omega, R_1 = 1\times 10^6 \; \Omega
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