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Friday, November 16, 2012

Elenco's PK-201 Experiment #2: The Brightness Control

In this experiment the focus is understanding the Variable Resistor (0 to 50k ohm). A device that has three pins (terminals to run electrical current through) and a dial. The dial is for increasing or decreasing resistance. When the dial is set to a minimum, the resistance is 0 ohms. Turn the dial to maximum then the resistance is set to 50k ohms. In the pictures, the Variable Resistor is wired from the center pin to left pin, center pin to right pin, or left pin to right pin. This means, depending on how the Variable Resistor is wired, that the resistance is measured between two of the three pins (left to center, right to center, or left to right). In the picture left to right, the resistance is between the left and center post. By turning the Variable Resistor to the right, one would increase the resistance hence dimming the light. In the picture right to left, the resistance is from right to center. By turning the resistance to the left, one would increase the resistance hence dimming the light. In the last picture, the resistance is 50k ohms. This is because the wiring is from left post to right post causing a lose of the variable attribute.

High Resistance (Left to Right)

Low Resistance (Left to Right)

High Resistance (Right to Left)

Low Resistance (Right to Left)


Full Resistance (None Variable)
 
 

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