A 120 V outlet is the standard residential and commercial electrical outlet for North America. When additional electrical power is needed, other outlet options are available, but typically, one or more duplex (meaning double, or two outlets) receptacle is installed in every residential and commercial room.
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It is a point in an electrical circuit where external devices can be plugged into. This in turn will supply the device with the appropriate voltage needed to operate the device.
Electrical wall outlet having two plug receptacles.
Do you mean definition? If so 110V = 110 volts-60hz = 60 hertz. Hertz is the cycles that the electricity runs at. 60hz. is the US standard. Europe is at 50hz.
All three, on 110V a split receptacle, on 220V a baseboard heater, on 440V a construction heater or similar resistive load.
On a three wire supply system if you connect the two 110V wires together and they are across the phase they will short out and trip the breaker. If the two 110V wires are supplied from across the phase and connected to a motor then the motor will run. If the 110V wires are on the same phase nothing will happen.
A 15 amp 125 volt outlet is a household outlet.