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A current is passed through the unknown resistance and measured.The voltage dropped across the resistance is measured by the voltmeter, and resistance calculated using Ohm’s Law (R=E/I).
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Except in special cases such as the megger, both the voltage and current quantities employed by the meter are quite small.
This presents a problem for measurement of low resistances, as a low resistance specimen may be of much smaller resistance value than the meter circuitry itself.
Very small resistances may be measured easily by using large current, providing a more easily measured voltage drop from which to infer resistance than if a small current were used.
Because only the voltage dropped by the unknown resistance is factored into the calculation—not the voltage dropped across the ammeter’s test leads or any other connecting wires carrying the main current—errors otherwise caused by these stray resistances are completely eliminated.When two meters are used, this is not as significant an issue, because the current and voltage indications may be recorded simultaneously.Take the voltage measurement and divide it by the current measurement.In electrical circuits, resistance is the property of an electric conductor by which it opposes a flow of electricity and dissipates electrical energy away from the circuit.It would be ideal in this experiment to have two meters: one voltmeter and one ammeter.The quotient will be equal to the specimen’s resistance in ohms.The new HTML5 sims can run on i Pads and Chromebooks, as well as PC, Mac, and Linux systems.Switch the meter to its voltage mode, connect it across the specimen’s connection points, and re-connect the battery, quickly noting the voltage indication.You don’t want to leave the battery connected to the specimen for any longer than necessary for obtaining meter measurements, as it will begin to rapidly discharge due to the high circuit current, thus compromising measurement accuracy when the meter is re-configured and the circuit closed once more for the next measurement.CROSS-REFERENCES Lessons In Electric Circuits, Volume 1, chapter 8: “DC Metering Circuits” LEARNING OBJECTIVES SCHEMATIC DIAGRAM ILLUSTRATION INSTRUCTIONS Although this experiment is best performed with two meters, and indeed is shown as such in the schematic diagram and illustration, one multimeter is sufficient.Most ohmmeters operate on the principle of applying a small voltage across an unknown resistance (R) and inferring resistance from the amount of current drawn by it.