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Wright Eduardo Lab 1 Report

Page history last edited by zahraa@... 4 years, 12 months ago

Part 1


I built the circuit in part C. 1. but I had to substitute the 150 ohm resistor with a 180 ohm resistor.


Part 2


a. What resistance do you need to limit current to 30 mA (if using red LED) or 25 mA (if using yellow or green)? Be sure to state which color LED you are using. This resistance refers to the total resistance in series with the LED.


Source Voltage: 5 Volts

Forward Voltage: 2.5 Volts

Current Limit: 25 mA


For a green LED, I need a resistance of 100 ohms.

R should be R = (Vcc - Vf) / I      -0.5


b. Is the resistance from question (a) a maximum or minimum resistance? That is, in which direction if you change the resistance (higher or lower) would the LED likely fail.


The resistance in question (a) is a minimum resistance. If the resistance was lower, the current would be higher and the LED would likely fail.


c. What is the resistance range of the potentiometer?


The resistance range of the potentiometer is 0 ohms to 10,000 ohms.


Part 3


a. Does it matter what order the components of your circuit are arranged between power and ground? Why or why not?


The order of the components does not matter because the current remains consistent throughout the circuit.

Part 4


a. Using this battery, what is the minimum resistance required for use with your LED?


Source Voltage: 9 Volts

Forward Voltage: 2.5 Volts

Current Limit: 25 mA


The minimum resistance required is 260 ohms.


Part 5


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Comments (1)

zahraa@... said

at 5:03 pm on Jul 6, 2015

Great Job

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