Chapter 22 Electromagnetic Induction

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<strong>22</strong>.7 The Electric Generator E = E 0 sin ωt , E 0 = NABω , maximum emf è emf from generators is sinusoidal in time è alternating current (ac) T = period = 1/f = 2π/ω
Example. A generator with a circular coil of 75 turns of area 3.0 x 10 -2 m 2 is immersed in a 0.20 T magnetic field and rotated with a frequency of 60 Hz. Find the maximum emf which is produced during a cycle. Solution: The maximum emf for a generator is E 0 = NABω We know N = 75, A = 3.0 x 10 -2 m 2 , B = 0.20 T and f = 60 Hz . Since ω = 2πf = 2π(60) = 377 radians/s E 0 = (75)(3.0 x 10 -2 )(0.20)(377) = 170 V
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Page 3 and 4: 22.5 Lenz’s Law LENZ’S LAW The
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Page 11 and 12: 22.7 The Electric Generator HOW AN
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Chapter 22 Electromagnetic Induction

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