Which computer component converts high-voltage AC current to low-voltage DC current? speakers
power supply
motherboard
cooling unit

Power supply

Explanation:

A Power supply unit (or PSU) converts high AC current  to low-voltage regulated DC current for the internal components of a computer.

Now a days personal computers universally use switched-mode power supplies.

Some of the power supplies have a manual switch for selecting input voltage, while modern computers automatically adapt to the mains voltage.

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