Lab 02 Ohms Law IVC 2009

Lab 02 Ohms Law IVC 2009 - Second Physics Laboratory 4B...

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Second Physics Laboratory 4B Laboratory Objectives: 1) Investigate the qualitative response of various circuits by graphing voltage versus current. 2) Determine quantitative values of the resistance of circuit elements under various conditions. pg 1 Response of Circuit Elements
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Introduction: The static resistance of a circuit element is defined by: I V R s = where V is the voltage across the circuit element (resistor, light bulb…) and I is the current through the circuit element. For some conductors the Resistance R s is constant at constant temperature, independent of the applied voltage . Such conductors are said to be ohmic and obey Ohms Law : V IR s = Response of Circuit Elements pg 2
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static resistance of such a conductor follows the equation R = R 0 [1 + αΔT] where R 0 is the resistance at 20 C and ΔT = T – 20C . Other materials have a nonlinear response; the graph of V versus I is not a straight line. For these materials, it is useful to define the dynamic resistance as: I V R d = which is the local value of the slope of the V vs. I curve and hence much like a derivative of voltage with respect to current. Response of Circuit Elements
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Lab 02 Ohms Law IVC 2009 - Second Physics Laboratory 4B...

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