Example of electrical computation formulas for electrical calculation involving the function and operation of DC motors

Example 1: The field winding of a shunt DC (Direct Current) motor has a resistance of 110 ohms, and the emf (electro-motive force) applied to it is 220 volts. What is the amount of power expended in the field excitation?

Why does a 3 phase AC induction motor have to be connected in star delta (or wye delta) configuration - What is the significance and advantage of using star and delta in motor connection

Three phase AC induction motors are known to have a very high start-up surge current. The most practical approach to reduce the high start-up inrush current is by firstly implementing a star (or wye) configuration to the motor's 6 leads wiring terminal during the start-up run of the motor. When the motor slowly picks up speed and a significant decrease in the amount of current is achieved then the motor's 6 leads wiring terminal is then reconfigured to a delta connection.