In addition to traditional Ohm's law labs and equivalent resistance (parallel and series circuits). Rob Spencer suggested a P vs. V "dry" lab. I think it could be done though with a vanity bar???
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This was a challenge to connect the concepts of charges, e-fields, and potential. The group drew a charged capacitor, 2 light bulbs in series and an open switch. We were asked how we knew it was charged and what had to be done to do this and what exists in the capacitor.
We were talking about how the "charges pile up" right before the resistor/light bulb (I have a problem with this idea--all charge carriers in a circuit have the same drift speed--the volume flow rate must be constant--all circuit components with zero resistance in any particular branch need to have same KE of charge carrieres). We also talked about how the pressure before the resistor was higher than after. I am more comfortable with this approach. |
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