Inductor/Resistor/Capacitor Equivalency

Nov 23, 2004 3 Replies
M

Hello,



I'm a Chemical Engineer that took an "Electrical Engineering for Non-Electrical Engineers" class as part of my degree ~7 years ago. I was wondering if somebody can reconstruct my failing memory when I recalled my instructor saying something to the effect that "For a resistor, inductor, capacitor, one can be simulated by the other two" I don't recall in what context he was speaking - or if I'm recalling it correctly. It definetly had something to do w/ interchangeability. Can somebody direct me to a text or website concerning this matter?



Regards,



Monty,


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W

Nope, can't simulate an inductor using a resistor and capacitor. Use a capacitor and an operational amplifier?

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Perhaps he meant that you can construct a single-stage lowpass filter using either an inductor *or* a capacitor, plus a resistor. Same is true for hipass.

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E

Hi. In an alternating current context, a resistive value R can be obtained as capacitive reactance Xc=R or by inductive reactance XL=R. XL = 2¶fL Xc = 1÷2¶fC In resonant circuits, capacitors and inductors together (in series or parallel) can also yield a resistive value equal to R from a resistor.

Maybe that is what you mean. Miguel

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S

Nope! Can't be done iMHO, whichever way you look at it.

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