Multiple choice

Alternating current is converted into direct current by a _____.

  1. transformer

  2. dynamo

  3. oscillator

  4. rectifier
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A rectifier converts alternating current (AC) to direct current (DC) by allowing current flow in only one direction, using diodes in various configurations (half-wave, full-wave, bridge). Transformers only change AC voltage levels, dynamos generate electricity, and oscillators produce AC signals.

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