n order to avoid voltage consumption during power transference and too low of voltage at the power consumption peak in summer, the power company will send the power with a little higher voltage. If to output the left voltage to the load to control and adjust to proper voltage and guide the current to go down, then the iron loss will go along with the voltage square, when the copper loss of all kinds of the home appliances of the power consumer is close to the iron loss, this is the time when the power consumption efficiency at the peak,