chapter27_1

# chapter27_1 - Chapter 27 Current Resistance And Resistor...

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Chapter 27 Current Resistance  And  Resistor

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Electric Current, the definition Assume charges are moving perpendicular to a surface of area A If Δ Q is the amount of charge that passes through A in time t , then the average current is t Q I avg = or dt dQ I = + + + + + + I A
Electric Current, definition and unit Electric current is the rate of flow of charge through some region of space The SI unit of current is the ampere (A) 1 A = 1 C / s And ampere is a base unit. The unit for time, second, is also a base unit. The unit for charge is then defined as 1C=1A/1s The symbol for electric current is I

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Direction of Current 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. It is conventional to assign to the current the same direction as the flow of positive charges The direction of current flow is opposite the direction of the flow of electrons It is common to refer to any moving charge as a charge carrier
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chapter27_1 - Chapter 27 Current Resistance And Resistor...

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