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What is the importance of the upper resistor in this circuit

  1. Feb 18, 2015 #1
    The book also says you can increase the time delay by increasing the resistance of the upper resistor , why, what does it do?

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  2. jcsd
  3. Feb 18, 2015 #2

    phinds

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    You need to study basic RC circuits. Think about this circuit with nothing but the upper resistor and the capacitor/switch pair (and a voltage applied across the two in series. What does this circuit do?
     
  4. Feb 18, 2015 #3

    davenn

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    increasing the value of the upper resistor ( the one currently marked 22k) decreases the current flow to the capacitor
    and therefore the capacitor takes longer to charge up

    Dave
     
  5. Feb 18, 2015 #4
    Ok the explanation is clear. Thank you very much.
     
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