Discussion on the Experiment of Designing and Assembling Ohmmeters

This paper conducts in-depth discussion on the design and assembly of Ohmmeters,calculates the electric current and resistance in the series and parallel circuits,and presents the specific calculating formulas and selected methods for the choice of parameters of components in experiment.It is found that in this experiment,the circuit test results are very accurate under the condition that the battery voltage is accurately 1.5 v.However,with the change of voltage,the test value for the series circuits may vary significantly up to 30%,while the result for parallel circuit is relatively accurate.The relative difference is below 0.5% when the voltage varies between 1.2v to1.9v.