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T6D01
Which of the following devices or circuits changes an alternating current into a varying direct current signal?
Pick an answer to check it.
Answer: B. Rectifier
A rectifier changes alternating current (AC) into direct current (DC) that still varies, or pulses. It is usually built from diodes that let current pass in only one direction. A transformer changes AC voltage but leaves it as AC.
Tip: Rectifier: AC in, pulsing DC out.