more resistors activity 6.2.3a © 2011 project lead the way, inc.magic of electrons
TRANSCRIPT
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More ResistorsActivity 6.2.3a
© 2011 Project Lead The Way, Inc.Magic of Electrons
![Page 2: More Resistors Activity 6.2.3a © 2011 Project Lead The Way, Inc.Magic of Electrons](https://reader035.vdocument.in/reader035/viewer/2022062300/56649f445503460f94c65b73/html5/thumbnails/2.jpg)
Variable Resistors
Potentiometers
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Variable Resistors
A resistor whose value can be varied mechanically between its minimum and maximum values
Schematic SymbolFor
Potentiometers
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Potentiometer Lab
On your activity sheet, draw a schematic diagram using a 3 volt DC source that will power two LEDs in parallel, and includes a fixed resistor on only ONE of those LEDs.
Build the circuit as shown so that you can easily insert various resistors.
Schematic SymbolFor
Potentiometers
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Potentiometer Lab
• Identify the color bands on the supplied resistors and calculate the resistor amounts.
• Rank your resistors 1 through 5, with #1 the resistor having the smallest amount of resistance, and #5 with the greatest amount of resistance.
• Follow the rest of the instructions on your activity sheet, answering the questions as work through the lab.
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Finish this statement:
The __________resistance, the
brighter the light.
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Variable Resistors
Thermistors
TEMPERATURE SENSITIVE resistors. INCREASING the temperature DECREASES the resistance.
Schematic SymbolFor
Thermistors
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Thermistor Lab
On your activity page, draw a schematic diagram of a series circuit powered by 3 DC volts that contains an LED and a thermistor.
Follow the instructions in your activity worksheet to complete this lab. Be sure to answer all questions completely, and to get your instructor’s signature verifying your finished circuit.
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Variable Resistors
A light-sensitive device in which the internal resistance changes with a change in light intensity
Photoresistors
Schematic SymbolsFor
Photoresistors
Either symbol can be used
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Variable Resistors
Photoresistors
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PhotoresistorsOn your activity page, draw a schematic diagram of a series circuit that uses 3 DC volts that will power an LED and is controlled by a photocell.
• Following the instructions found on your activity sheet, build the circuit that you designed (you may want to space the photocell far from the LED).
• Cover and then use the lamp to adjust the amount of light reaching the photocell.
• Be sure to answer all the questions as you complete the activity.
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Image Resources
Microsoft, Inc. (2009). Clip Art. Retrieved January 13, 2009, from http://office.microsoft.com/en-us/clipart/default.aspx