-A transformer with a 10:1 turns ratio has a 120 Vac line input. The transformer secondary is connected to a half-wave rectifier circuit using a capacitor filter. Ignoring any ripple, what is the dc output voltage from the circuit?
A) 16.3 V
B) 10.4 V
C) 5.7 V
D) 3.6 V

Question

-A transformer with a 10:1 turns ratio has a 120 Vac line input. The transformer secondary is connected to a half-wave rectifier circuit using a capacitor filter. Ignoring any ripple, what is the dc output voltage from the circuit?
A) 16.3 V 
B) 10.4 V 
C) 5.7 V 
D) 3.6 V

Quizplus · Accepted Answer

The transformer reduces the voltage by a factor of 10, so the secondary voltage is 12 V (120 V / 10). A half-wave rectifier with a capacitor filter essentially charges the capacitor to the peak voltage of the AC waveform. The peak voltage of a sinusoidal waveform is √2 times the RMS voltage, so the peak voltage here is 12 V * √2 ≈ 16.97 V. The diode in the rectifier circuit will have a voltage drop, typically around 0.7 V, so the output voltage is approximately 16.97 V - 0.7 V ≈ 16.3 V.

-A Transformer with a 10:1 Turns Ratio Has a 120