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lecture11 - Physics 102 Lecture 11 Generators and...

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Generators and Transformers Physics 102: Lecture 11 Verify ‘EX’ grades for Exam #1!
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Review: Magnetic Flux φ is angle between normal and B B A φ n o rmal Φ = B A cos( φ29 Units is T m 2 = Wb
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Review: Induction Faraday’s Law Magnitude of induced EMF given by: Lenz’s Law – If the magnetic flux ( Φ B ) through a loop changes, an EMF will be created in the loop to oppose the change in flux EMF current (V=IR) additional B-field. Flux decreasing => B-field in same direction as original Flux increasing => B-field in opposite direction of original 7 i f i f t t t - Φ - Φ - = ∆Φ - = ε
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Review: Rotation Variables v, ϖ , f , T Velocity (v): How fast a point moves. Units: usually m/s Angular Frequency ( ϖ ): How fast something rotates. Units: radians / sec ϖ r v v ϖ = v / r f = ϖ / 2 π T = 1 / f = 2 π / ϖ Frequency ( f ): How fast something rotates. Units: rotations / sec = Hz Period (T): How much time one full rotation takes. Units: usually seconds 10
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Generators and EMF ε loop = ϖ B A sin( ϖ t) Φ = BA cos( ϖ t) v v x θ ϖ r 1 2 13 ε t ϖ AB AB EMF is voltage! Φ = B A cos( θ ) = B A cos( ϖ t) ε loop = - ∆Φ / t = ϖ B A sin( θ ) = ϖ B A sin( ϖ t )
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Generators and EMF v v x θ ϖ r 1 2 13 ε t ϖ AB AB EMF is voltage! Φ = B A cos( θ ) = B A cos( ϖ t) ε loop = - ∆Φ / t = ϖ B A sin( ϖ t ) flux is maximum when emf is 0 And vice versa Φ t - AB AB
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ACT: Generators and EMF x ε
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