Three resistances, each having a resistance of 20 Ω, are connected in delta across a 500 V supply. The current in each phase resistance is approximately:

A DC motor draws an input power of 1000 watts from the power supply. The armature copper losses are measured to be 50 watts, and the core losses are 30 watts. Calculate the total losses in the DC motor and its efficiency.

What is the apparent power of a 3-phase, star-connected system with a line voltage of 200 V and a line current of 20 A? The phase difference between the voltage and the current is 36.87°.