What is Ohm’s Law

Chapter 2.5 Ohm’s Law

Lessons In Electric Circuits Volume VI – Experiments Book
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Lessons In Electric Circuits Volume VI – Experiments Book

  • 42CHAPTER 2. BASIC CONCEPTS AND TEST EQUIPMENT2.5Ohm’s LawPARTS AND MATERIALS• Calculator (or pencil and paper for doing arithmetic)• 6-volt battery• Assortment of resistors between 1 KΩ and 100 kΩ in valueI’m purposely restricting the resistance values between 1 kΩ and 100 kΩ for the sake ofobtaining accurate voltage and current readings with your meter. With very low resistancevalues, the internal resistance of the ammeter has a significant impact on measurement accu-racy. Very high resistance values can cause problems for voltage measurement, the internalresistance of the voltmeter substantially changing circuit resistance when it is connected inparallel with a high-value resistor.At the recommended resistance values, there will still be a small amount of measurementerror due to the ”impact” of the meter, but not enough to cause serious disagreement withcalculated values.CROSS-REFERENCESLessons In Electric Circuits, Volume 1, chapter 2: ”Ohm’s Law”LEARNING OBJECTIVES• Voltmeter use• Ammeter use• Ohmmeter use• Use of Ohm’s LawSCHEMATIC DIAGRAMBatteryAAmmeterResistorV VoltmeterILLUSTRATION