In most of the house appliances, why is ac signal is using instead of dc?
AC and DC Power:
The electric supply in the household is usually Alternating-Current and not Direct Current. Alternating Current is sinusoidal in nature, i.e. it changes levels frequently in cycles. Direct Current, on the other hand, is the current supply at a steady level.
Answer and Explanation:
Household appliances use alternating current (AC) mainly because AC can be stepped up and down easily and thus has a capacity to be manipulated for various electrical divices. Also, high voltages from power stations can be stepped down easily for the household.
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from CLEP Natural Sciences: Study Guide & Test PrepChapter 6 / Lesson 7