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what is power factor? whether it should be high or low? why?

Power factor is the ratio of true power to apparant power
and it is the cosine of angle between voltage and current

P=V I *pf

if pf is poor ex: 0.17 to meet actual power load has to
draw more current(V constant),result in more losses

if pf is good ex: 0.95 to meet actual power load has to
draw less current(V constant),result in less losses

if cosign angle is 80degrees cos 90= 0.17 means pf =0.17
current vector is lagging 80degrees (i>>v) so load draws
more current so losses are high

if angle is 20 degrees cos 20 = 0.93 means pf =0.93 (good
pf) current is lagging only 20degrees, i value is less

so to decrease current drawn of the load we have to
maintain good pf

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