25 - AC Generation

# 25 - AC Generation - Physics 212 10/26/2009 AC Generation...

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Physics 212 Fall 2009 10/26/2009 AC Generation

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Schedule AC Power Impedance, Phasors Oscillations Magnetism Maxwell’s Equations This Week Next Week
Summary Electromagnetic Storage Devices Inductor Capacitor L = N Φ B i U B = 1 2 Li 2 u B = B 2 2 μ 0 C = q V U E = 1 2 CV 2 u E = 1 2 ε 0 E 2 i (0) = R i ( ) = 0 i (0) = 0 i ( ) = R i = R 1 e R L t i = R e t RC Charging

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How is AC Power Generated?
Generators Electromagnetic induction produces electricity for industrial and home use. Use an energy source to turn coils in Feld of electromagnets. Burn coal, use nuclear Fssion to create steam to turn turbine hydroelectric power

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AC Waveform Rotating Coil Creates Alternating Current (AC) ε = N d Φ B dt = N d ( BA cos θ ) dt = NBA d cos dt d cos dt = d dt sin = ω t 0 = NBA = 0 sin( t )
AC Voltage and Current (R) Purely Resistive Load angular frequency ω ω = 2 π f f = 1 T = 2 T phase angle ϕ =0 Voltage and current are “in phase” f =60 Hz - current reverses direction 120 times/sec if v d ~10 -5 m/s, then Δ x~10 -7 m /half cycle ~ 10 atoms T V = V 0 sin( t ) I = V R I = I 0 sin( t + φ )

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## This note was uploaded on 10/03/2011 for the course PHYS 212 taught by Professor Tedeschi during the Spring '08 term at South Carolina.

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25 - AC Generation - Physics 212 10/26/2009 AC Generation...

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