Question one A balanced star connected load comprises of 20 ohm resistance and 0.07 Henry inductance in each branch. If the load supplied with 415V at 50Hz, calculate a) the line current b) the power factor c) the total power supplied to the load PLEASE FOLLOW THIS APPROACH TO SOLVE THE QUESTION. THANK YOU Step One Deduce the inductive reactance. STEP Two Write down a rectangular expression for the impedance per branch. STEP Three Convert the rectangular expression into polar expression. STEP Four Because impedance will be involved in the analysis deduce the phase voltage. STEP Five Solve for the phase current and hence the line current. STEPVSix Use the phase angle of the current to deduce the power factor.  STEP Seven Find the apparent power.

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.