Physics 201- Introduction to Electricity & Magnetism
October 14- Introduction to Ohm's Law







Notice that were no longer talking about electrostatics- charges are now moving.

To define current, think of water flowing through a pipe  There we can talk about the volume of water that flows through the piper in a time interval and from this find the flow rate.  Here we can develop a similar quantity- the rate that charge that flows past a point

Remember, charge is not created or destroyed

There is an unfortunate sign switch when talkinga about current- electrons move to the right, but current is to the left.

When we define the current, we assume that positive charges are actually moving.

For most of the semester, we will stick to mostly DC circuits & mostly linear components.


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Jeff Phillips
Loyola Marymount University
Fall 2002