voltage - What does the symbol and rating mean on this power plug? - Electrical Engineering Stack Exchange

Why is "no load power input 75mW max @230V AC 50-60Hz", but input is "100-240V ~ 50-60V 0.5A which results in 115W (230V x 0.5A)? What do the 3 symbols mean? Thank you for reading

SHNITPWR AC Adapter 120W Universal Power Adapter 4V 5V 6V 9V 12V 15V 18V 19V 20V 24V Adjustable Switching Power Supply 100V~240V AC to DC 4V ~ 24V 5A Converter with

How can a voltage screwdriver light up when I test the ground wire or chassis of my washing machine, but multimeter reads no voltage or current flow? - Quora

What does the output voltage reading on a plug mean? If you use a plug with an output voltage that is too high for an appliance, could that damage the appliance?

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Why are power outlets rated by voltage as opposed to, say, amperage, resistance or wattage? - Quora

What does this symbol on the box of power supply mean? - Electrical Engineering Stack Exchange

rf - Is there a standard that specifies the polarity when using an SMA connector (or similar) to connect a DC power source? - Electrical Engineering Stack Exchange

Single-Phase and Three-Phase Voltage by Country - EVESCO