If three identical electrical loads of 80Ω each are connected in STAR (Wye) topology to a 3-phase supply of line voltage 240√3 V, then what will be the line current?

Two tram cars (A and B) located 2 km and 6 km away from a substation return 40 A and 20 A, respectively, to the rails. The substation voltage is 600 V DC. The resistance of the trolley wire is 0.25 Ω/km and that of the track is 0.03 Ω/km. Calculate the voltage across each tram car.

If a voltmeter gives full-scale deflection for 10 V, and its sensitivity is 1000 Ω/V, its internal resistance is: