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For a chopper, Vs is the source voltage, R is the load resistance and δ is the duty cycle. Rms and average values of thyristor currents for this chopper are
δ . V s R , δ . V s R
δ . V s R , δ . V s R
δ . V s R , δ . V s R
1 - δ . V s R , 1 - δ . V s R