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I NEED HELP WITH THIS....
When operating at rated load, a 120 VAC 60HZ single phase induction motor can be modeled as a 10.8 ohm resistor in series with a 25.3 millihenry inductor. Under these conditions, what will be the power factor?
Somebody correct my math, but I get PF=.757
XL= 2iifL = 9.3
Z = 14.25
I = 8.42 amps
theta = 40.73
cos theta = .757
Good luck,
James
You should know better than to temp the gods by saying "Someone correct my maths.."
2iifL = 2 * ii * 60 * 25.3 *10^-3 = 9.54 ohm
giving
PF = .75 ffej
cosΦ=pf= r/sqrroot(r2+w2l2)=10.3/√(10.3)2+(25.3*.001)2(60)2