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DC Motor for efficient propeller design project
Posted: Fri Oct 30, 2015 12:28 pm
by deleted-315199
Hi, I'm trying to do the efficient propeller design experiment, but I don't understand the instructions of how to attach the DC motor to the multimeter using the materials that were recommended. I have the 1.5-3 V DC motor, the 4.7 kohm resistors, the jumper leads, and the multimeter, but I can't really figure out what to do with them from the instructions in the procedure. Please respond ASAP.
Re: DC Motor for efficient propeller design project
Posted: Sat Oct 31, 2015 4:48 pm
by kmyers2040
Hi,
First, lets start with connecting the resistor across the motor terminals:
Take one of your alligator clips, and clip one end to one terminal and clip the other end to one side of the resistor.
Take your second alligator clip and clip one end to the second motor terminal and clip the other end to the second side of the resistor.
Now, for your multimeter measurements, you are going to be measuring the voltage across the terminals.
You can do this several ways. One option is to connect one mulitimeter probe to one terminal and the other multimeter probe to the other terminal.
However the voltage across the resistor will be the same as the voltage across the terminals since they share electrically common points. And it may be easier to make your measurements across the resistor if the motor terminals are small. You can attach one probe to one side of the resistor and one probe to the other side of the resistor (and you can use the alligator clips you already have attached to the resistor to hold the probes as well).
Here is a link that has a good explanation and diagram of the setup I am describing, it is the second image in the page (expect it is a diagram of a battery terminal instead of motor terminal):
http://www.allaboutcircuits.com/textboo ... ssipation/
Hopefully that helps, let us know if you have more questions and good luck with your project!