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DC Circuits: Electric PowerBy: Rory McPhersonTA Jie ZhangLab Partners: Mike Russell, Andrew Wallach
Objective:Determine the load resistance number at which the power is optimized in a DC circuit experimentally.Procedure:R0was measured directly using the DMM in ohms keeping in mind to remove the effective internal resistance. The DC circuit was connected as I an V values were taken for increasing load resistance. The load resistance was increased in increments of 10 ohms from 10-100, then 20 ohms from 120-200, and then 100 ohms from 300-100. The power dissipated by the resistor was calculated for each value and a graph of power vs. load resistance was made. Using the graph, and the load resistance, a max power output was found. This was done with a load resistance of 100 ohms and 200 ohms. Results:R0= 100 Ohms – RL,max = 120 Ohms – P