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	Subject - Resonance Question jonathan03 I am trying to find the resonace frequency of a circuit but I'm having some trouble. This is for a class but I have tried very hard to find how to do it on my own. I'm not looking for a full answer with all the steps, but I just need a little help. The book I am using shows examples for only series and parallel RLC circuits. But all the problems the book gives are neither parallel or series. One problem that I am doing is in parallel with three branches. One branch is a single resistor. Another is an inductor and resistor. The last is a resistor and capacitor. Here is a picutre of the circuit: http://enginecontrol.dyn.ee/circuit.jpg The book says the resonance frequency is 1/Sqrt(LC), but this is only for parallel circuits. The resistors mixed in are really throwing me off. It never talks about anything that isn't series or parallel, but none of the questions are for series or parallel circuits. I know that when a circuit is in resonance the voltage drop across the inductor and capacitor cancel each other out. Also, the phase angle should be +- 90 degrees for the L and C. ZT should also be equal to Req. Can anyone provide some suggestions to get me started? Do I need to find Zt first? I am just looking for some guidance, not for someone to do the problem. Thanks for the help. wareagle You have 3 circuits in parallel. Convert the 1 ohm and 1 mfc in parallel with the 10 ohm resistor to and equal ckt. You then have a RC ckt in parallel wiht a RL. Check this location http://hyperphysics.phy-astr.gsu.edu/hbase/electric/parres.html#c1