# lec13 - • The peak value of the induced EMF is • The AC...

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The AC Generator A generator is a device that converts mechanical energy into electrical energy. An A lternating C urrent is generated in a coil that is made to rotate in a magnetic field. For a coil with N turns that is rotated with a constant angular speed ( ω ) in an uniform magnetic field ( B ) , the induced EMF is given by t NBA t N ε sin = ∆Φ = t (rad) π/2 π3 π / 2 ω ε NBA = 0 ω ε sin B ω B I B B I B 1 2 1 2 1 2 1 2

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The AC Generator (continue) The induced EMF reverses it direction every half of a revolution (hence A lternating C urrent).
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Unformatted text preview: • The peak value of the induced EMF is • The AC voltage from power company refers to the rms value of the EMF, which is related to the peak EMF by • The rotational angular speed ( ω ) determines the frequency ( f ) of the AC • Therefore, an AC of 120 V at 60 Hz means which is generated with a rotational angular speed ω = 60 rev/s ( 120 π rad/s ). NBA ε= 707 . 2 ε = = rms 2 = f V rms 120 =...
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## This note was uploaded on 12/06/2011 for the course PHYSICS 111&112 taught by Professor Unknown during the Spring '11 term at Ohio State.

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lec13 - • The peak value of the induced EMF is • The AC...

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