chapter27_1class

chapter27_1class - Chapter 27 Current Resistance And...

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Chapter 27 Current Resistance And Resistor
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Electric Current, the definition c Assume charges are moving perpendicular to a surface of area A c If Δ Q is the amount of charge that passes through A in time Δ t , then the average current is t Q I avg Δ = or dt dQ I = + + + + + + I A Anyone notices a difference of this figure compared with the one in the book? If yes, and explain why I draw it this way. Correct answer = 1 bonus point How many of you preview, review, do homework within 2 days of class, 2 days toward due date?
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Electric Current, definition and unit c Electric current is the rate of flow of charge through some region of space c The SI unit of current is the ampere (A) c 1 A = 1 C / s c And ampere is a base unit. The unit for time, second, is also a base unit. c The unit for charge is then defined as 1C=1A/1s c The symbol for electric current is I
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Direction of Current c The charges passing through the area could be positive or negative or both. This area may or may not be an actual physical surface and the charges can flow in a conductor or in vacuum. c
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chapter27_1class - Chapter 27 Current Resistance And...

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