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How to check a power supply with a multimeter? What to measure to identify a malfunction? How to check a power supply for compliance with the declared characteristics? The video is designed for beginners and it explains and shows in great detail what and how to check to find out if the power supply is working or not. The video explains and shows how to easily and quickly check a power supply and a phone charger for compliance with the declared characteristics and for operability. It explains what a load is and how to correctly check how many amperes a phone charger produces, or how many amperes a power supply produces. It shows how to calculate the load to load the power supply for testing. It shows what to load the power supply with, it shows how to measure and what to pay attention to. In general, a video for beginners about the correct testing of power supplies.