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25 - AC Generation

# 25 - AC Generation - Physics 212 AC Generation Fall 2009...

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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) = ε R i ( ) = 0 i (0) = 0 i ( ) = ε R i = ε R 1 e R L t i = ε 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 field of electromagnets. Burn coal, use nuclear fission 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 θ dt d cos θ dt = d θ dt sin θ θ = ω t ε 0 = NBA ω ε = ε 0 sin( ω t )
AC Voltage and Current (R) Purely Resistive Load angular frequency ω ω = 2 π f f = 1 T ω = 2 π T phase angle ϕ =0 Voltage and current are “in phase” f

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25 - AC Generation - Physics 212 AC Generation Fall 2009...

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