Task id16580

The shunt generator has an emf. E = 380 V, armature winding resistance Rа = 0.5 Ohm, inductor resistance Rа = 80 Ohm (Fig. , b). Find the current in the external circuit, voltage on the brushes and efficiency. generator with external circuit resistance R1 = 20 Ohms. Find efficiency machine with external circuit resistance R2 = 40 Ohms.