Intro to Biasing

Our objective is power and light up two separate LEDs that have different Voltage ratings and different current ratings. By doing Biasing we will attempt to establish correct voltages and currents across the LEDs so they will not burn out

we start by calculating the resistances needed to acquire our desired voltages.

R led1

176Ω

R led2

350Ω

we then calculate the following

I R1	22.75mA	I R2	20mA
V R1	4V	V R2	7V
R1	176Ω	R2	350Ω
P R1	.091W	P R2	.14W

and after looking at the available resistors we decide to use

R1

220Ω

R2

360Ω

we choose our resistors and acquire the following measurements

color code (List Colors)	Nominal Value	Measured Value	Wattage
2200	220	213	1/8W
3600	360	352	1/8W
4700	470	459	1/8W

after building the ciruit

we obtain these values

Config	I led1	V led1	I led2	V led2	I supply
1	10mA	5.9V	14mA	2.11V	24mA
2	10mA	5.9V	X	X	10mA
3	X	X	14mA	2.11V	14mA

BONUS*

Both LEDs must be in this circuit for it to work properly because of increased current.

A. 8.3 hrs
B. 44%
C. 93%