Bought a lamp in ikea and it came with 2 black wires. Instructions

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Bought a lamp in ikea and it came with 2 black wires. Instructions

Which wire goes to which? They aren't colored… : r/askanelectrician

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Bought a lamp in ikea and it came with 2 black wires. Instructions show black and white… can't really differentiate though one is ribbed and thicker and the other one is smooth

Can I tell by wire markings on AD/DC power supply which wire is positive and which is negative? : r/AskElectronics

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