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Published byHarvey Davidson Modified over 6 years ago

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Alternating Current Characteristics of AC The Transformer Transmission Rectification

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Coil rotating in a magnetic field Generator – Dynamo – Alternator

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Coil rotating in a magnetic field

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Flux cut by rotating coil

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Coil rotating in a magnetic field

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EMF induced in the rotating coil

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EMF induced

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Effect of increasing angular speed

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The Root Mean Square (rms) The square root of the mean of the squares Step 1

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The Root Mean Square (rms) Step 2

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The Root Mean Square (rms)

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Example 1

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The Transformer

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The Transformer (How it works) Alternating current causes changing magnetic field in the primary coil This field is made stronger by the soft iron core which links the changing magnetic field to the secondary coil Changing magnetic field in secondary coil induces emf in its coils

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The Transformer

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Transmission of Electrical Power

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Transmission

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Rectification The conversion of alternating current (AC) to direct current (DC) This involves a device that only allows one-way flow of electrons semiconductor diode

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Half-wave Rectification allows one half of an AC waveform to pass through to the load

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Full-wave Rectification Full use of both half of an AC waveform to pass through to the load

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Full-wave Bridge Rectifier Full use of both half of an AC waveform to pass through to the load but multiple waves per unit time (smoother)

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Capacitor Smoothing Capacitor charges when voltage is rising Capacitor discharges when voltage is falling

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Capacitor Smoothing

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