How to find out the load of the power supply?

Question

Iron

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Answer 1

Buy an adapter socket with a wattmeter and you will consume any device.
Turn on the socket with a wattmeter and sequentially, starting from the motherboard, start connecting devices to the PSU.
The difference between adjacent measurements will give the exact consumption of the next connected device.
Here's another look here: How to measure the real load on the power supply?

If there is software that can be removed for 120 rs and then watch the load on the bp, then there will be no price for him =)

see towards snmp-managed corporate uninterruptible power supplies.

Answer 2

The question is incomplete and not entirely clear. Briefly - conventional computer power supplies do not have such functions.
The question does not indicate what consumption you need to know - how much PSU consumes from the outlet (then a UPS with a USB output and appropriate software, or a wattmeter, or a "smart socket" also with software), or how much each channel gives (+ 12V, + 5V , +3.3V ...), or how much does each device in the computer consume in total (motherboard, processor, video card, hard drive, etc.), or each device with channel details?
Theoretically, you can hang a bunch of current sensors on each wire, and bring them all into one device, which will have an ADC and, for example, a USB interface - you can watch all this.
You can read about load blocks for ATX PSUs, which are used in PSU repair and / or testing - I came across articles and topics on forums where this was discussed. They just have a controlled load and sensors on different channels, and software for monitoring these channels.

Answer 3

current clamp

Answer 4

Cофтом никак.
А так - есть специальные тестеры которые включаются между БП и компьютером, есть блоки питания с индикацией, есть ваттметры в розетку.