An AC electrical power dividing circuit includes a hot line, a neutral
line, a ground line, two output ports, a first voltage-dividing module, a
second voltage-dividing module, a first sampling resistor, and a second
sampling resistor. The hot line is coupled to the ground line via the
first voltage-dividing module and the first sampling resistor in turn.
The neutral line is coupled to the ground line via the second
voltage-dividing module and the second sampling resistor in turn. One of
the output ports is connected to a node between the first
voltage-dividing module and the first sampling resistor. Another one of
the output ports is connected to a node between the second
voltage-dividing module and the second sampling resistor. The AC
electrical power dividing circuit supplies adjustable AC power to an AC
electrical device from a 110 V or a 220V power source.