Power Sources: AC and DC Explained
Power sources in electronics come in many varieties. The most common categories are alternating current (AC) and direct current (DC), each with its own subtypes and applications.
DC voltage can be delivered by a battery or by a dedicated power supply circuit. A power supply circuit can be fixed or variable, depending on its design.
AC is typically obtained from household power outlets or from generators that convert fuel into electricity. Variable AC supplies also exist, again depending on the circuit design.
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