In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?
Correct answer: B. More than D.C. value
- A. Equal to D.C. value
- B. More than D.C. value
- C. Less than D.C. value
- D. Zero
Explanation
For a half-wave rectified sine wave with peak current I0, the total rms current is I0/2 and the DC current is I0/pi. Thus the AC component is sqrt((I0/2)^2 - (I0/pi)^2) = 0.385I0, whereas the DC value is I0/pi = 0.318I0, so the AC component is greater.
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About Rectification
Rectification converts alternating current into unidirectional current using semiconductor diodes. The content includes half wave and full wave rectifiers, bridge circuits, output waveforms, ripple and smoothing with capacitors, with the difference between rectification and voltage regulation kept clear.
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