Question
What component changes 120 V AC power to a lower AC voltage for other uses?
Answer Options
- A) Variable capacitor
- B) Transformer
- C) Transistor
- D) Diode
Correct Answer: B
Explanation
A Transformer is an electrical component that operates only with AC signals. It uses electromagnetic induction to safely step down (or step up) the voltage from one level to another while keeping the signal as AC (Alternating Current).
For example, a typical power supply uses a step-down transformer to take the high 120\text{ V} AC wall voltage and safely step it down to a lower \text{AC} voltage (like 15\text{ V}) before that voltage is then rectified into DC (T6D01).
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