More RLC Troubles: How the Resistor Disappears

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In summary, the conversation is about a student's surprise when they noticed a resistor disappearing in a problem after looking at the solutions. The student cannot understand how the resistor disappears and speculates that the solutions might have been for a different circuit. The conversation also touches on the fact that the voltage source is a short circuit and is still present in the circuit despite the solutions stating otherwise.
  • #1
NewtonianAlch
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Homework Statement


http://img69.imageshack.us/img69/1123/85049619.jpg [Broken]


Got a nasty surprise after finishing the problem and looking at the solutions to see the resistor disappearing at tax time.

I can't figure out how the resistor disappears, I can only think the people who solved this were looking at a different circuit of sorts.
 
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  • #2
NewtonianAlch said:

Homework Statement


http://img69.imageshack.us/img69/1123/85049619.jpg [Broken]


Got a nasty surprise after finishing the problem and looking at the solutions to see the resistor disappearing at tax time.

I can't figure out how the resistor disappears, I can only think the people who solved this were looking at a different circuit of sorts.

The voltage source is a short circuit (if it's an ideal voltage source), and it's in parallel with the resistor...
 
Last edited by a moderator:
  • #3
It would have been better if the solutions didn't say the LC circuit was disconnected from the voltage source. It's not. The voltage source has to still be there to ensure no current flows through the resistor.
 

1. What is RLC and how does it relate to resistors?

RLC stands for Resistor-Inductor-Capacitor circuit and it is a type of circuit that contains all three components. A resistor is a passive component that resists the flow of electric current and is commonly used to control the amount of current in a circuit.

2. Why does the resistor disappear in an RLC circuit?

In an RLC circuit, the resistor can appear to disappear due to the effects of inductance and capacitance. When an alternating current is applied to the circuit, the inductor and capacitor can cancel out the effects of the resistor, making it seem as though it is not present.

3. How does the disappearance of the resistor affect the circuit's behavior?

The disappearance of the resistor can significantly alter the behavior of the circuit. Without the resistor, the circuit may exhibit resonance, where the voltage and current are in phase and the circuit has maximum power. This can also cause the circuit to have a higher quality factor, meaning it can store energy efficiently.

4. What are some real-world applications of RLC circuits?

RLC circuits have many practical applications, such as in electronic filters, oscillators, and amplifiers. They are also used in power supplies, radio and television receivers, and electric motors.

5. How can I troubleshoot RLC circuits with disappearing resistors?

If you are experiencing issues with a disappearing resistor in your RLC circuit, there are a few steps you can take to troubleshoot the problem. First, check all connections and make sure they are secure. You can also try changing the frequency of the input current or adjusting the values of the inductor and capacitor in the circuit. If the problem persists, it may be necessary to consult with a professional or refer to circuit diagrams for further troubleshooting.

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