question 1

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Calculate the maximum DC voltage available from a half wave rectifier Shown . Also find the reading of the milli ammeter. 

Solution:-

Turn ratio of transformer = 20:1
Number of turns in primary binding = 20
Number of turns in secondary binding = 1
Mains voltage supply(1/p) Vp = 220 v

From the Transformer ratio formula
Np/Ns = Vp/Vs
20/1 = 220/ Vs
Vs = 220/20 = 11V
Vrms = Vm/√2 
=> Vm = Vrms √2
=> Vm = 11 √2
Vm = 15.5563 v

Vdc =  2Vm /π
Vdc = 2×15.5563/π = 9.90V
I = V/R => 9.90/1×1000
I = 9.90mA

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