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This text is meant to accompany class discussions. It is not everything there is to know about the basics of torque and the two conditions of equilibrium. It is meant as a prep for class. More detailed notes and examples are given in the class notes, presentations, and demonstrations (click here.)
Questions Click for the questions that go with this reading
Stored Energy

A capacitor is a device for storing energy in the electric field between the plates.

PArallel Plate Capacitor

Charges move from one plate to the other and as they do this they deliver energy to any components inbetween the plates. It is a common miscomception that the charges give up all of their energy. They only give a maximum equal to the potential difference across the capacitor's plates. But at the capacitor discharges, it loses charges and therfore changes the potential difference.


This video can be found on YouTube at


Energy stored in a capacitor is

This can be used to come up with a second useful form.

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by Tony Wayne ...(If you are a teacher, please feel free to use these resources in your teaching.)