A strain gauge, having a gauge factor of 1,96, is mounted on a rectangular steel bar (196GPa), see figure. The bar is 2,4 cm wide and 1,4 cm high, and is subjected to a tensile force of 21 kN.Suppose the strain gauge described is to be connected to a measurement device capable ofdetermining a change in resistance with a stated uncertainty of ±0,005 Ω (95%). What uncertainty in stresswould result (in percent of the stress under the given loading) when using this resistance measurement device?

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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.