(a) The DC motor, with the flywheel clamped (w = 0), is described by the electrical schematic of Figure 4.4. The resistance R, has been added to obtain voltage measurements, so that the current's time response can be viewed on an oscillo- scope. Find Vo(s)/Vi(s) in terms of Ra, Rs, and La. What is the electrical time constant, Te, for the motor? R TMT R www armature 4 Figure 4.4.: Motor Electrical Diagram: Flywheel clamped. Note: The final model of the motor we will develop will not have Rs. This is only used for identification.