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Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (one joule per second). Use this tag where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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Power switch circuit

The drawings below are controlled power switches. I already tried them both and seems to work. Can someone tell me please which is better to use? Any advantage and disadvantage. …