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Lab # 5Group Members: ___________________________________Ohm’s Lawusing a PhET SimulationThe fundamental relationship among the three important electrical quantities current, voltage, and resistancewas discovered by Georg Simon Ohm. The relationship and the unit of electrical resistance were both named for him to commemorate this contribution to physics. One statement of Ohm’s law is that the current through a resistor is proportional to the voltage across the resistor and inversely proportional to the resistance. In this experiment you will see if Ohm’s law is applicable by generating experimental data using a PhET Simulation:Current and voltage can be difficult to understand, because they cannot be observed directly. To clarify these terms, some people make the comparison between electrical circuits and water flowing in pipes. Here is a chart of the three electrical units we will study in this experiment.Electrical QuantityDescriptionUnitWater AnalogyVoltage or PotentialDifferenceA measure of the Energy difference per unit chargebetween two points in a circuit.Volt (V)Water PressureCurrentA measure of the flow of charge in a circuit.Ampere (A)Amount of water flowingResistanceA measure of how difficult it is for current toflow in a circuit.Ohm (W)A measure of how difficult it is for water to flow through a pipe.Figure 1Open Source: NSU Physics/PHET Activities 1
Ohm’s LawOBJECTIVESDetermine the mathematical relationship between current, potential difference, and resistance in a simple circuit.