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Switching can be defined as the change in state whether it be an analog, digital, or mechanical device. For digital devices, switching can be defined as a transition from HIGH to LOW or vice versa. For analog devices, switching can be defined as a change of operation within a transistor. Mechanical device examples include physical light switches or button switches. Ultimately, switching interrupts current from going into another conductor path.

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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.
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