AP Physics L07_current Effects of moving charges

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Presentation transcript:

AP Physics L07_current Effects of moving charges Electric Current Effects of moving charges

Objectives Relate current, potential and resistance using Ohm’s Law. Determine the power in a current flow. Describe the flow of current in a circuit.

Electric Current Current = charge flux / time = Dq Dt Current = charge flux / time = current Unit: C / s = ampere = A

Question What is the direction of the electric current? A. right B. left + -

Current Density Vector J Units: A/m2 I = ∫J·dA

Drift Speed Charge carriers are electrons They move thermally really, really fast Net velocity giving current (drift speed) is much less than average thermal speed