What is the reason for the sound of current coming from the computer power supply?

What is the reason for the sound of current in the computer power supply?

1. The computer power supply will produce a slight sound of current.

2. The voltage-reducing circuit in the power supply will have a relatively large current, and the large current flowing through the conductor will cause the conductor molecules to collide. This is the often heard current sound.

3. The computer has a fan, and the sound of the fan is much louder than the sound of the current. If the sound of the current is greater than the sound of the fan, it means that the power supply will be damaged and it is recommended to replace it.

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