problem27_50

problem27_50 - 27.50: a) Field current I f = 120 V =...

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Unformatted text preview: 27.50: a) Field current I f = 120 V = 0.550 A. 218 Ω b) Rotor current I r = I total − I f = 4.82 A − 0.550 A = 4.27 A. c)  V = ε + I r Rr ⇒ ε = V − I r Rr = 120 V − (4.27 A)(5.9 Ω) = 94.8 V. 2 2 d)  Pf = I f R f = (0.550 A) (218 Ω) = 65.9 W. e)  Pr = I r2 Rr = (4.27 A) 2 (5.9 Ω) = 108 W. f) Power input = (120 V) (4.82 A) = 578 W. Poutput (578 W − 65.9 W − 108 W − 45 W) 359 W = = = 0.621. g) Efficiency = Pinput 578 W 578 W ...
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