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lecture17

# lecture17 - L ecture 17 A C Current Generators S elf...

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Lecture 17: AC Current / Generators Self Inductance

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Physics Concept Components Learning Outcome Magnetic Force and Field Charged particle motion Ampere’s Law Induced EMF Faraday’s Law Lenz’s Law Self inductance Mutual inductance Evaluate the force on and simple motion of a charged object in a magnetic field Evaluate the force on wires Evaluate the magnetic fields from wires Compute magnetic fields using Ampere’s Law. Predict the effects of a varying magnetic flux on conductors (especially wires). August 28, 2013 2 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
Rotating wire loop(s) in permanent B-field The flux causes induced alternating current August 28, 2013 3 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer At the heart of most power plants is a turbine.

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Build the dam Use the water pressure Turn the turbine August 28, 2013 4 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
Steam the water Turn the turbine Condense the water August 28, 2013 5 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer

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Steam the water Turn the turbine Condense the water August 28, 2013 6 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
Rotating wire loop(s) in permanent B-field The flux causes induced alternating current August 28, 2013 7 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer Φ B = BA cos ω t ( ) ε = ω BA sin ω t ( )

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In order to determine the power we must make our wire loop into a simple circuit with some resistance. August 28, 2013 8 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer Φ B = BA cos ω t ( ) ε = ω BA sin ω t ( ) P = ε 2 R = ω BA sin ω t ( ) ( ) 2 R
Physics Concept Components Learning Outcome Magnetic Force and Field Charged particle motion Ampere’s Law Induced EMF Faraday’s Law Lenz’s Law Self inductance Mutual inductance Evaluate the force on and simple motion of a charged object in a magnetic field Evaluate the force on wires Evaluate the magnetic fields from wires Compute magnetic fields using Ampere’s Law. Predict the effects of a varying magnetic flux on conductors (especially wires). August 28, 2013 9 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer

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In circuits, the induced EMF always comes from a change in current. Thus, it is useful to define inductance, typically denoted by L , as the coefficient of the induced times the change in current.
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