More RLC Troubles: How the Resistor Disappears

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SUMMARY

The discussion centers on the behavior of a resistor in an RLC circuit when an ideal voltage source is present. Participants clarify that the voltage source acts as a short circuit in parallel with the resistor, leading to the resistor's apparent disappearance in the circuit analysis. The confusion arises from the solutions suggesting that the LC circuit is disconnected from the voltage source, which is incorrect. The voltage source must remain connected to prevent current from flowing through the resistor.

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Homework Statement


http://img69.imageshack.us/img69/1123/85049619.jpg


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.
 
Last edited by a moderator:
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NewtonianAlch said:

Homework Statement


http://img69.imageshack.us/img69/1123/85049619.jpg


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:
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.
 

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