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The timing device in an automobile’s intermittent wiper system is based on an RC time constant and utilizes a $0.500-\mu \mathrm{F}$ capacitor and a variable resistor. Over what range must $R$ be made to vary to achieve time constants from 2.00 to 15.0 s?

$R_{\text {range}}=4-30 \mathrm{M} \Omega$

Physics 102 Electricity and Magnetism

Chapter 21

Circuits, Bioelectricity, and DC Instruments

Direct-Current Circuits

University of Michigan - Ann Arbor

University of Washington

Hope College

McMaster University

Lectures

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The timing device in an au…

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A charging $R C$ circuit c…

03:16

A capacitor is charged to …

04:57

A 4.00 -M\Omega resistor a…

01:28

A 500.0$\Omega$ resistor i…

01:44

Consider the series $R C$ …

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How many time constants mu…

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A resistor and a capacitor…

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The current in an $R L$ ci…

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(1) Estimate the range of …

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A $2.00-$ and a $7.50-\mu …

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A 15.0 $\mathrm{k} \Omega$…

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A capacitor in an $R C$ ci…

So the time constant for RC circuit is simply even by multiplication, off resistance on the capacitors. So for two seconds, that is the minimum off time Constant. So for two seconds, resistance is child about it. My see, the child is two seconds and capacitance is 20.5 micro fired. So this must be 10 power. Negative six there 0.2 divided by 0.5 is full. So this will be a tramp. Our part to six. So we can say for maybe one now. Similarly, for 15 seconds, resistance is equal to how divided by see again How is 15 now? Divided by 0.5 times 10 power. Negative. Zeus. So this is the factor off 30. So 30 maybe I own So we want resistance between off range. Formiga own to thaw. Timmy got one.

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