PHY213_Chapter20_Sec5to8

PHY213_Chapter20_Sec - Chapter 20 Induced Voltages and Inductance Inductors RL Circuits Sections 58 General Physics Generators Alternating

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Chapter 20 Induced Voltages and Inductance
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General Physics Inductors & RL Circuits Sections 5–8
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General Physics Generators Alternating Current (AC) and Direct Current (DC) generators Converts mechanical energy to electrical energy Consists of a wire loop rotated through a magnetic field by some external means There are a variety of sources that can supply the energy to rotate the loop • These may include falling water, heat by burning coal to produce steam
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General Physics AC Generators As the loop rotates ( θ changes), the magnetic flux through the loop changes with time This induces an emf and a current in the external circuit (toaster) The ends of the loop are connected to slip rings that rotate with the loop Connections to the external circuit are made by stationary brushes in contact with the slip rings The output voltage oscillates between positive and negative polarity The current is an AC current
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General Physics AC Generators – Rotating Loop Wires BC and AD act as bars moving vertically through the horizontal magnetic field between the N and S poles. An emf is generated in wires BC and AD The total emf produced in these 2 wires is ε = 2 B ℓ v = 2 B ℓ v sin θ If the loop rotates with a constant angular speed, ω, the emf generated by the rotating loop is ε =2 B ℓ (a / 2) ω sin ωt = B A ω sin ωt If a coil has N turns, the emf is N times as large ε = N B A ω sin ω t Active Figure: AC Generator
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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PHY213_Chapter20_Sec - Chapter 20 Induced Voltages and Inductance Inductors RL Circuits Sections 58 General Physics Generators Alternating

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