7. The ability of material to oppose the flow of electrons? a. current b. voltage c. resistance d. circuit 8. What do you call the difference of electrical energy between two points? a. current b. voltage c. resistance d. circuit 9. What do you call the material that does not allow electric current to pass through? b. conductor c. insulator C. c. super conductor d. none of the above 10. Which will possibly happen when 4 LEDs with forward voltage of 3V is connected in series with 9-volt power source? a. All will light in full brilliance. b. The first three light is in full brilliance while the last one light is dimmer. c. The first two light is fully in brilliance, the third is dim and the last has no light. d. The first will light fully, the second is dim and the last two has no light. Additional Activities Read each scenario and explain comprehensively the following questions: 1. If 10 LEDs with 2 volts forward voltage connected in series with 12-volt battery what would possibly happen? Why? 2. If 10 LEDs 2 volts forward voltage connected to 12-volt battery in parallel what will happen? Why?

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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.