To verify that, in fact, the D to Y transformation performs as advertised. We will also check how the equivalent circuits behave under a variety of loads.
Procedure:
1) Wire the following circuit on the project board with the power off. After having the circuit verified by the instructor you may turn the power on and begin your measurements. Note that you will be making simultaneous measurements of the source current and the voltage across the load. Have your DMMs wired into the circuit before approval. Once again careful attention to circuit wiring and organization will pay benefits in the long run. Hint: Consider how you will replace the D configuration of resistors with the Y configuration so that you won’t need to disassemble the whole circuit.
2) With infinite load resistance (open circuit) determine the load voltage. Like previous labs this is the ideal load voltage and should be consistent with that which we would calculate for this circuit (not doable until we perform the D to Y transformation.)
3) For four load resistors between 0 W and 10 kW measure the source current and the load voltage.
4) Calculate the appropriate values for the D to Y transformation and replace the three resistors with the appropriate values and in the correct configuration.
5) Repeat steps 2 and 3.
Lab Notebook:
The following information should be clearly presented in your lab notebook along with explanatory commentary.
I) A clear drawing of each circuit constructed including the DMM(s) as you used them.
II) Measurements for each ideal load voltage and ultimately calculations verify this number based on your circuit analysis.
III) Data collected indicating the source current and load voltage dependence on the load resistance.
IV) Plots of source current and load voltage as a function of load resistance. These represent sets of data that could be combined into two plots (or even one, if you really know what you’re doing)
V) A succinct analysis of the performance of each circuit. This analysis should show your ability to recognise and articulate whether these circuits behave equivalently under load. Indicate the experimental evidence in support of your conclusions.
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