phy131_lecture10 - Lecture 10 Electric current Current drift velocity Resistance Resistivity Ohms law Ammeters voltmeters Power 1 e e e e e ee A metal

phy131_lecture10 - Lecture 10 Electric current Current...

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1 Lecture 10 Electric current Current & drift velocity Resistance & Resistivity Ohm’s law Ammeters & voltmeters Power
2 e - e - e - e - e - e - e - e - A metal wire. Assume electrons flow to the right. Current is a measure of the amount of charge that passes though an area perpendicular to the flow of charge. dt dq I = : Current Current units: 1C/sec = 1 amp = 1 A
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Example: If a current of 80.0 mA exists in a metal wire, how many electrons flow past a given cross-section of the wire in 10.0 minutes?
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