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Sinusoidal Current of Generator +E xx. . -E The emf varies sinusoidally with max and min emf For N turns, the EMF is: E NBAwsin q
Example 5: An ac generator has 12 turns of wire of area 0.08 m 2 . The loop rotates in a magnetic field of 0.3 T at a frequency of 60 Hz. Find the maximum induced emf. w = 2pf = 2p(60 Hz) = 377 rad/s Emf is maximum when q = 90 0 . E max =NBAw; Since sinq 1 E = max 2 (12)(0.3 T)(.08 m )(377 rad/s) . n q B x f = 60 Hz The maximum emf generated is therefore: E max = 109 V If the resistance is known, then Ohm’s law (V = IR) can be applied to find the maximum induced current.
Page 1 and 2: Electromagnetic Induction
Page 3 and 4: Induced Current When a conductor mo
Page 5 and 6: Magnetic Flux Density • Magnetic
Page 7 and 8: Example 1: A current loop has an ar
Page 9 and 10: Example 2: A coil has 200 turns of
Page 11 and 12: Example 3: Use Lenz’s law to dete
Page 13 and 14: Motional EMF in a Wire Force F on c
Page 15 and 16: The AC Generator • An alternating
Page 17: Calculating Induced EMF Rectangular
Page 21 and 22: The Electric Motor In a simple elec
Page 23 and 24: Example 6: A series-wound dc motor
Page 25 and 26: Summary (Cont.) Lenz’s law: An in
Page 27 and 28: Summary (Cont.) The ac generator is
Page 29: CONCLUSION: Chapter 31A Electromagn

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