Physics 201 Introduction to Electricity & Magnetism 

October 14 Introduction to Ohm's Law  



Current
Notice that weíre 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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