We will be starting capacitor circuits. Check out the two videos below. The first introduces you to capacitance, defined through the relationship Q = CV, where Q is the stored charge of a capacitor, C is the capacitance (measured in a unit called a farad), and V is the voltage difference across a capacitor. In particular, you will see an old friend, Gauss's law, to find an E-field, then integration to find the voltage difference, and then a determination of C from the definition.

This video is

http://docvphysics.blogspot.com/2009/12/how-to-find-capacitance-for-each-type.html

Next, capacitor circuits in series, parallel and combinations are similar to resistor circuits you already have done. The rules are all similar, so check this out to compare and contrast R circuits to C circuits. Keep in mind that we have the same two rules for finding series and parallel capacitance, only flip-flopped for capacitors (compared to resistors).

http://docvphysics.blogspot.com/2009/12/how-to-find-charge-on-capacitors-in.html

## Thursday, February 6, 2014

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