Chap31_PHY2049 - Chapter 31 – Alternating Current-...

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Unformatted text preview: Chapter 31 – Alternating Current- Phasors and Alternating Currents- Resistance and Reactance- Magnetic-Field Energy- The L-R-C Series Circuit- Power in Alternating-Current Circuits- Resonance in Alternating-Current Circuits- Transformers 1. Phasors and Alternating Currents t V v ω cos = Ex. source of ac: coil of wire rotating with constant ω in a magnetic field b sinusoidal alternating emf. t I i ω cos = v, i = instantaneous potential difference / current. V, I = maximum potential difference / current b voltage/current amplitude. ω = 2 π f Phasor Diagrams- Represent sinusoidally varying voltages / currents through the projection of a vector, with length equal to the amplitude, onto a horizontal axis.- Phasor: vector that rotates counterclockwise with constant ω . I i rav π 2 = Rectified average current (I rav ): during any whole number of cycles, the total charge that flows is same as if current were constant (I rav ).- Diode (rectifier): device that conducts better in one direction than in the other. If ideal, R = 0 in one direction and R = ∞ in other....
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This note was uploaded on 07/30/2011 for the course PHY 2049 taught by Professor Saha during the Spring '08 term at University of Central Florida.

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Chap31_PHY2049 - Chapter 31 – Alternating Current-...

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