Question

A 228V constant potential generator delivers load to a variable impedance whose values of R and X 

are readily adjustable. Assuming a looking-back impedance of (6+j4.5) ohms calculate, for maximum 

power,

a. The load impedance

b. The current

c. Load power

d. power factor

Answer 1

a) For maximum power transfer the load impedance $=6-j4.5$

b) The current $=228/12= 19A$

c) The load power$=I^2R=19^2\times6=2166W$

d) The load power factor is $Cos(tan^{-1}(4.5/6) )=cos36.86\degree=0.8lead$