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lab 5-241

# lab 5-241 - Matt Weiner Phys 241 Lab Lab Partner Phillip...

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Matt Weiner Phys. 241 Lab Lab Partner: Phillip Hoffman 10/03/06 Resistance and Ohm’s Law Goal: to investigate the nature of the resistance of several Ohmic devices such as resistors. Series and parallel circuits of resistors will be studied. Also, the resistance of the measuring equipment itself will be measured. Theory: The ratio of voltage, V , applied across an electrical component, to current, I , that flows through the component is defined to be the resistance, R, of the component: I V R (1) The resistance of a component may change if the applied voltage changes. In general, the resistance is a function of applied voltage that is R=R(V) . Knowing the function R(V) (or equivalently the V vs. I plot) of an electrical component completely specifies the behavior of the component in a direct current circuit. The resistance does not change as the applied voltage changes. These components obey Ohm’s law and are said to be Ohmic. Ohmic components will be studied in this experiment and non-Ohmic components will be studied in a later experiment. Then R is a proportionally constant between current and applied voltage: IR V (2) A battery is an example of a device that is not Ohmic, because without any applied voltage, there can be current flow. Devices can obey Ohm’s law for one range of applied voltages and not obey it in another range of voltage. IIa. Measure 10 resistor using the DMM as a voltmeter and a l.5 A ammeter, measure the current as a function of applied voltage for the 10 resistor.

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