The endless mysteries of the universe keep you up at night. One night the madden

Question

The endless mysteries of the universe keep you up at night. One night the maddening allure of measuring internal resistance is all you can think about. Luckily, you keep your trusty Fluke 175 by your bedside for just such an emergency. You use your multimeter to find the change in potential across a non-regulated power source when that power source is on, but not connected to any resistors. You measure the voltage as 11.66. You then connect a 1k Ohm resistor to this same power supply and measure the potential across the electrodes of the power supply again. This time you measure the voltage as 7.17. What is the internal resistance of the power supply? Do not include units in your answer.

Explanation / Answer

V/V1 = R/R 1

11.6/7.17 = 1+R1/R1

11.6 R1 = 7.17 + 7.17 R1

The resistance of internal resistor R1 = 1.618

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