RMS voltage and Fourier coefficients for thyristor regulator with 10Ω load

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Dzikaz
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A single-phase ac voltage regulator has a resistive load of R= 10 ohms, and the input voltage is Vs = 240 V, 50 Hz. The delay angle of each of the Thyristors is ɑ = Π/2. Determine:

(a) The rms value of the output voltage.
(b) The Fourier coefficients of the fundamental, 11th and 13th current harmonics
 
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