The primary and secondary windings of a 500-kVA, 11-kV/415-V, single-phase transformer have resistances of 0.42 Q and 0.0019 Q, respectively. Its core losses are 2.9 kW. Assuming the power factor to be 0.8 leading, determine its % efficiency on half load.

Find the resistance of a piece of 8 AWG lead wire 600ft long. Consider the temperature to be 20 degree Celsius

(b) The circuit in Figure Q2 (b) below shows a rectifier circuit where Vin is a 10kHz sine wave with an amplitude of 2Vpp and RL is 10k. (i) (iii) The componet between A and B is a PN diode, sketch and label its silicon structure and explain its characteristics. Sketch the waveforms you would see at A and B and explain or sketch how you would connect your scope probes to measure them. Label your sketches clearly showing values and axis details. Comment on any similarities or differences between the waveforms at A and B.