Simple Voltage and Current Measurement :: essays research papers

Experiment I artless Voltage and Current MeasurementObjectiveThe objective of this experiment was to neb the Voltage and Current. Upon completion of this experiment I was able to1)Set the DC power total to a specific emf.2)Properly connect the voltmeter to saloon potential difference.3)Measure legitimate with the ammeter.4)Measure resistance with the ohmmeter.5)Determine the accuracy of a given meter rendition.TheoryThe theory required for this experiment was an judgment of Ohms Law. Ohms Law is the algebraic relationship between voltage and certain for a resistor. Resistance is the capacity of materials to impede the flow of current or electric charge. Ohms Law expresses the voltage as a function of the current. It was also necessary that the concept of step accuracy be understood. This is discussed below.Accuracy is of primary importance in an experimental work. The tolerance quoted by the meter manufacturer allows us to calculate the accuracy of any readingtaken with th at particular meter. For example, assume that the dc voltage scale on aparticular multimeter is rated at 3% of full-of-the-moon scale. This means that a reading onthe 10V scale is accurate to ( 0.03%)(10) = 0.3V. Thus, a reading of 9V on the10V scale indicates a true voltage, which lies between 8.7 and 9.3 V. A reading of 1Von the scale would indicate a true voltage between 0.7 and 1.3 V. At this point, the error is 30% Any reading less than 10% of full scale should be viewed with suspicion since most meters are very inaccurate n this cheat.Circuit DiagramsFor this experiment we used a Power preparation source, voltmeter/ammeter/ohmmeter.Fig 1.1 Power supplying and voltmeter in parallelPower SupplyVoltmeter-Fig 1.2 Simple voltage measurement circuit.aab a ba ad c c dc dFig 1.3 Simple current measurement circuitPower Supply(Be sure current I match is atmaximum setting)Fig 1.4 Circuit to measure resistance routineTo measure the voltage output of the power supply, we connected the voltmeter as shown in Fig. 1.1. We made sure that the voltmeter is always connected in parallel with the voltage being measured. Before turning on the power, we set the voltmeter voltage range to a DC value higher than the highest voltage we expected to measure. This guardianship must be observed with all meters in order to invalidate the possibility of burning out an expensive instrument.We then set the current control to maximum current and adjust the output voltage of the supply to values of 2.5, 10, and 15.