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LC, LR, RC Circuits

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by

Richard Datwyler

on 13 July 2016

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Transcript of LC, LR, RC Circuits

Circuits
LC Circuit
Both capacitors and inductors can store energy. A capacitor stores is more as potential, and an inductor more as kinetic.
I = 0
I = 0
+Q
-Q
- Q
+Q
Q = 0
Q = 0
I = max
I = max
to tune into 100.7 MHz what inductor should be paired with a 25 nF capacitor?
LR Circuit
If current is turned off in an LR circuit there is a drop of time for that current to be stopped by the resistor. It follows an exponetial decay with a time constant of:
A 15 Ohm resistor and a 2 mH intially have 7.5 A running through them, then the current is turned off. What is the time constant, the current at t = .5 ms, and when is the current is .5% its initial value?
RC Circuit
An RC circuit behaves nearly the same as an LC circuit. The capacitor is the element that stores the charge and provides the potential and current. We can thus discuss these elements as well as charging the capacitor.
What is the time constant for a 100 Ohm resistor in series with a 2 mF capacitor? If a 12 V potential is used to charge this capaitor, what is its max charge, and how long will it take to get to 99.5 % of that value?
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