Determine the ratio of resistance

[TyErd]

Homework Statement

Determine the value of the ratio R1/R2

sorry guys I forgot to write the values in, V1=0, V2=2.4V and A=10.8A

Homework Equations

V=IR

The Attempt at a Solution

I found thecurrent through R2 to be 6mA and then calculated resistance by doing 2.4/6mA=400ohms. Then i got stuck.

 

[phyzguy]

How could you possibly have calculated 6 mA unless you know V1, V2, and A? I think the problem is asking for R1/R2 in terms of V1, V2, and A.

 

[Cilabitaon]

The only way we could assume the potential drop across V1 and V2 is to know the colour of the LED...but we don't have that.

If you have the equation R=V/I then you can form equations for each resistor R1 and R2; if you are aiming for higher grades (>=A) at college level you should know how to form ratios of equations.

 

[TyErd]

Sorry guys I forgot to add the values in. My mistake. I've added the values in just then.