Test 2 - Physics 2102 Exam II Study Guide Current(i the net...

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Physics 2102 Exam II Study Guide Current (i): the net flow of charge; there must be a potential difference (V) to create a current; measured in amperes [A]. = i qt Think of current (i) as positive charge carriers flowing through a wire. There must be a complete path for current (i) to flow. Conservation of Charge = = + iin iout i1 i2 i3 Current Density (J): describes current flowing across a cross-sectional area of a conductor; points in the direction of the flow of the current (i); measured in [ ] Am2 = i J∙dA for constant J: = i JA Resistance (R): depends on the specific object in question; measured in ohms . Ω = R Vi Resistivity ( ρ ): depends on the material in question at a molecular level; measured in ohm meters [ Ωm ]. = ρ EJ Conductivity ( σ ): measured in inverse ohm meters 1Ωm . = = σ 1ρ JE Loop Rule: = ΔV 0 around any closed loop in a circuit. Junction Rule: = iin iout

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Across a Battery: - to + ; V increases (+ E ) + to - ; V decreases (- E ) Across a Resistor:
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Test 2 - Physics 2102 Exam II Study Guide Current(i the net...

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