The power factor of an AC generator operating singularly is determined by the （）

A.length increases
B.cross-sectional area increases
C.temperature increases
D.percent of metallic purities increases

A.the sum of the powers used in each load (resistor)
B.divided by the number of loads
C.always less than the power used in the smallest load
D.the sum of the powers used in each individual load never more than the power used in the largest load

A.series with a circuit
B.parallel with a circuit
C.series-parallel with a circuit
D.delta with the shunt