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# Sannasi_Arvind_Lab1 (1)

last edited by 5 years, 1 month ago

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.

For the green LED, the Vf is 2.2V, so the resistance needed is about 112 ohms.

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.

Decreasing the resistance would create a higher current because of the constant voltage, which would cause the LED to fail. The resistance is the minimum resistance.

c. What is the resistance range of the potentiometer?

0 ohms to 9.62 kohms

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

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

For the green LED, the Vf is 2.2V, so the resistance needed is about 272 ohms.

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