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# Annie Scalmanini Lab 1

last edited by 9 years, 5 months ago

Question 2:

2a. What resistance do you need to limit current to 20 mA?

V=IR
V = 5 volts
I = 20 mA

R = 5V/0.02A = 250 ohms

2b. Is 220 ohms a maximum or minimum resistance?

Minimum resistance.
(If we need a 250-ohm resistor to limit current to 20 mA, then the 220-ohm resistor will correspond to a larger current.)

2c. What is the resistance range of the potentiometer?

It was labeled as 0-10KΩ

Question 3:

3a. Does it matter what order the components of your circuit are arranged between power and ground? Why or why not?

Yes, the order of the components of my circuit between power and ground matters; for example, in the circuit diagram below,

Question 4:

4a. What is the minimum resistance required for use with the battery?

If we still want to limit forward current to 20 mA, and the battery supplies 9V, then the minimum resistance required for use with the battery is R = 9V/0.02A = 450Ω.