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

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Selecting the Right Transmission Line Impedance

Lithonia Lighting Contractor Select LQM Series 120/277-Volt Integrated LED White and Red Exit Sign W/Back Up Battery LQM S W 3 R 120/277 EL N M6 - The Home Depot

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I do not understand this polarity symbol with 3 circles: positive, round, negative, and no lines - Electrical Engineering Stack Exchange

ROCKSTONE POWER 1000 Watt Voltage Converter Transformer - Heavy Duty Step Up/Down AC 110V/120V/220V/240V Power Converter - Circuit Breaker Protection – DC 5V USB Port - CE Certified [3-Year Warranty]

Solved A standard North American wall socket plug is labeled

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

Why Are My LED Lights Dim? Stopping Excessive Voltage Drop

Electrical Symbols — Power Sources, Electrical Symbols — Terminals and Connectors, Electrical Symbols — Inductors