I am new to this and i am struggling on this problem. i am also realy struggling in my circuits class

 

This is what i have so far the knowns

Vs= 50v

Vz = 10 v

Iz = 32mA

R1 = 1K ohm

Rl =? "potentmeter"

 

i just got the multisim program and could draw the cir if need be

 

R1 is in series with the source and the zener and rl are in parallel

 

it wants me to determine the range of Rl, Il, Vrl

 

I havew so far is 50 /1K = 50mA

Vrl = 10 v

I l = 50mA-32 mA = 18 mA

Rl = 556 ohms

 

is this correct and how would i go about finding the range of Rl

 

thanks joe

"R1 is in series with the source and the zener and rl are in parallel"

 

here`s the problem, if VS =50 and VZ = 10 but throught a 1k resistor, if you ignore the VZ then the 1k will draw 50ma, with the zenner pulling only 10v then we may say the MA will be a fifth of this being 10ma

you say it`s drawing 32ma with a variable resistor across the Zenner diode, so you have to make up and extra 22ma, what resistance setting will the potentiometer be set at???

50 volts drawing 22ma is now the question!

 

I refuse to do your homework for you, but I`ve solved half of it for you, the rest is a walk in the park!!!!!

 

1 volt at 1 ohm = 1 amp... work from there and shuffle the equasion around until you find what will draw 22ma from a 50Volt supply