12 Figure P15.72 shows an audio amplifier using two identical op-amps con- nected in a bridge configuration. (a) Derive the expression for the voltage gain A, = vL/vr. (b) Design the system such that |voil= lvo2l = 12v- The largest resistor value is to be limited to 120 k2. (c) If RL = 252 and the peak op-amp output voltages are limited to +8 V, determine (i) the max- imum average power that can be delivered to the load and (ii) the peak cur- rents that each op-amp must source or sink. A1 R RL R4 R2 R3 A2 Figure P15.72

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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.