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66. The eﬀective resistance Reﬀ satisﬁes Irms Reﬀ = Pmechanical , or Reﬀ = Pmechanical
(0.100 hp)(746 W/hp)
= 177 Ω .
(0.650 A)2 This is not the same as the resistance R of its coils, but just the eﬀective resistance for power transfer
from electrical to mechanical form. In fact Irms R would not give Pmechanical but rather the rate of energy
loss due to thermal dissipation. ...
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