3. Consider the voltage signal v(t) below as the reference. Express the voltage source in peak, peak-peak and effective value VRMs. Express the magnitude of the current in terms of its' effective value IRMS. Approximate the frequency f of the voltage source. Approximate the phase angle 0 from the reference voltage source to the current 12.5 Af f= Vpeak = IRMS= e= 7.5 10+ VRMS = 2.5 Vpeak-peak = 5- -10 v(t) 12 18 24 30 36 42 48 54 60 i(t) t(us) The circuit drawing this current from the voltage source could be more (circle one): Capacitive OR Inductive

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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.