2. Calculate the desired voltage or current values for the following cases using Ohm's Law: a. Calculate the current through the 1.5ka resistor, if the voltage drop is 15 V. b. Calculate the current through the 2700, 7500, 6.8kn, 100kn and 750ka resistors respectively, if the voltage drop is 15 v. How does the current change with increasing resistance if the voltage remains constant? c. Calculate the current through the 6.8kn resistor, if the voltage drops are 5V, 10v, 15V, 20V and 25V respectively. How does the current change with increasing voltage if the resistance remains contant? d. If a soldering iron draws 0.65 A at 120 V, what is its resistance? e. The internal resistance of a dc generator is 0.50. Determine the loss in terminal voltage across this internal resistance if the current is 12 A.

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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.