What is the importance of the upper resistor in this circuit

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    Circuit Resistor
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Discussion Overview

The discussion centers around the role of the upper resistor in an RC circuit, specifically its impact on the time delay associated with charging a capacitor. Participants explore the relationship between resistance and current flow in the context of circuit behavior.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant notes that increasing the resistance of the upper resistor can increase the time delay in the circuit, prompting questions about the underlying mechanism.
  • Another participant suggests that the circuit should be considered with just the upper resistor and the capacitor to understand its function better.
  • A participant explains that increasing the value of the upper resistor decreases the current flow to the capacitor, resulting in a longer charging time for the capacitor.

Areas of Agreement / Disagreement

Participants generally agree on the relationship between the upper resistor's value and the time delay in the circuit, but the discussion remains exploratory without a definitive consensus on all aspects of the circuit's behavior.

Contextual Notes

Some assumptions about the circuit configuration and the specific values of components may not be fully addressed, and the discussion does not resolve the broader implications of these relationships.

Syndy
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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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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?
 
Syndy said:
The book also says you can increase the time delay by increasing the resistance of the upper resistor , why, what does it do?

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
 
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Ok the explanation is clear. Thank you very much.
 

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