Black is used for the "Hot" wire.
White is used for the "Neutral" wire.
Green (or bare wire with no insulation) is used for the "Ground" wire.
IF YOU ARE NOT ALREADY SURE YOU CAN DO SOME ELECTRICAL WORK
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do any such work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicatorto insure the circuit is, in fact, de-energized.
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If both wires are black, the one that connects to your white wire is the one that should have little writing on it. Black to the plain black wire, white to the wire with writing.
Wall receptacles are wired in parallel. black to black, white to white, ground to ground.
the black wire is the hot wire
In a household circuit, with a "hot" conductor insulated black and a white neutral, the black wire should connect to the center terminal of the socket. The outside part of the socket usually has a brass screw (for the black wire) and a nickel screw (for the white wire).
In typical American wiring the black wire on an outlet goes to the gold (copper) screw and the white wire goes to the silver screw. The ground wire goes to the green screw.