AC Circuits

# AC Circuits - Formula Sheet M = B dA = BA cos Vinduced dM =...

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Formula Sheet cos M Bd A B A θ Φ= = G G M induced d VN dt Φ =− (/ ) Fe v B e E evB e V d V vdB = == G GG G LI Φ = 2 0 M NA NBA I l μ = 0 inside N B I l = induced dI V= L dt 0 () (1 ) Rt L It e R E 2 1 2 UL I = 0 C C l I ⋅= G G 0 2 4 I B R π = G 0 2 2 4 Ir B R = G

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) Power in AC circuits 2) RLC-circuits: oscillation 3) AC circuits:“Reactance” and “Impedance”
Resistance - Reactance Resistor: Current in Phase with Voltage, Resistance Capacitor: Voltage runs behind Current , Reactance (decreases with increasing frequency) Inductance: Voltage runs ahead of Current, Reactance (increases with increasing frequency) at 0 ° R R= const V = R I phase 1 at 90 phase ° CC C X= V = X I C ω at 90 phase ° LL L L V = X I +

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Power into Inductance / Capacitance What is the power delivered by AC to an Inductance L ? Power is delivered to the Inductance, Power is returned by the inductance On Average: No power () () () () Peak Peak cos t sin cos sin Vt=V It= I t P t= V t t t ω
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## This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.

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AC Circuits - Formula Sheet M = B dA = BA cos Vinduced dM =...

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