Missing resistor parallel circuit


Joined Mar 30, 2015
Welcome to AAC!

In homework help, you need to show your best effort so we can see where you're having difficulty.


Joined Mar 31, 2012
Thanks. Was trying to figure out the equation
So show your work. Maybe we can help. What is your starting point? If you have known values for R1 and R2, how would you calculate Rt? Start with that formula.

Also, see if you can place some limits on what the value of R2 can be? What would Rt be if R2 was 20 Ω? Based on that, does R2 need to be more or less than 20 Ω. This will help you catch wrong answers instead of just blindly accepting them.