Question

A shunt motor armature resistance 0.08Ω is connected to 120V mains. With 50A in the armature, what are the back emf and the mechanical power developed within the armature?

Answer 1

$r=\frac UI=2.4~\Omega,$

$\epsilon=I(R+r)=2.62~kV,$

$P=\varepsilon I=131~kW.$