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Question G7A13:
In a switched-mode power supply, what is the first step in converting the 120 volt AC input voltage to a 12 volt DC output voltage?
Answers:
A.The 120 volt AC is first rectified and filtered
B.The 120 volt AC is first converted to 12 volt AC with a transformer
C.The 120 volt AC is switched off when the waveform exceeds 12 volts, and is switched on again when the waveform drops below 12 volts
D.An AC clamp is used to limit the input signal to no more than 20 volts DC
Correct answer is:A
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