What is the importance of the upper resistor in this circuit

In summary, increasing the resistance of the upper resistor in a basic RC circuit will decrease the current flow to the capacitor, resulting in a longer time delay for the capacitor to charge up. This is explained further in the book as a way to increase the time delay in the circuit.
  • #1
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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  • #2
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?
 
  • #3
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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  • #4
Ok the explanation is clear. Thank you very much.
 

FAQ: What is the importance of the upper resistor in this circuit

1. What is the purpose of the upper resistor in this circuit?

The upper resistor in this circuit serves as a current-limiting resistor, controlling the amount of current flowing through the circuit. It also helps to stabilize the voltage and prevent damage to other components.

2. How does the upper resistor affect the overall performance of the circuit?

The upper resistor plays a crucial role in the performance of the circuit by regulating the flow of current and ensuring that the voltage remains within a safe range. It also helps to prevent overheating and other potential issues that could affect the functionality of the circuit.

3. Can the upper resistor be replaced with a different value resistor?

Yes, the upper resistor can be replaced with a resistor of a different value, but it is important to choose a resistor with the appropriate resistance to maintain the desired current and voltage levels in the circuit.

4. What happens if the upper resistor is removed from the circuit?

If the upper resistor is removed from the circuit, the current flowing through the circuit will increase significantly, potentially causing damage to other components. The voltage may also become unstable, leading to unpredictable performance and potential malfunction of the circuit.

5. Can the upper resistor be omitted from the circuit design?

In some cases, the upper resistor can be omitted from the circuit design if the circuit is designed to operate without it. However, in most cases, the upper resistor is a necessary component for maintaining the proper functioning and safety of the circuit.

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