Wednesday, January 13th

1. To measure the current with the DMM, you must break the circuit, and then complete the circuit through the DMM. To measure the voltage, you just have to put your leads from the DMM across the point at which you want to measure, such as the resistor in our case.

2. You can get 3 different voltages with the power supply. The first output is fixed at 5 volts, while the second two outputs are adjustable, from 0-24 volts.

3.


Here is a image of our first practice circuit on the right. On the left is a picture of the resister we burned while testing Ohm's law.



Here is a video of our setup for testing Ohm's law.



4.  Ohm's Law Data

Above is the data we collected from testing Ohm's law. We used a 100 ohm resister for the first test, and a 820 kilo-ohm resistor for the second test. We repeatedly ran different voltages over the two resistors, and measured the current that passed through them. We then used Ohm's law, RI=V, to see if the resistance values matched up. They were not exact, but they were close. For the 100 ohm resister, we found the the resistance was diminishing with each trial, but that was because we were slowly burning it. For the 820 kilo-ohm resistor, our results were a little more jumpy, but it could have been to human error. They were still in the ball park of 820. Below is a picture of our setup. The previous video showed the same setup.

5. Here is our video of our Rube Goldberg Machine Circuit. 

 

Chris Ruby