Need help some physics problems?

How would I solve problems when given this:

Let RS = R. If R1 = 50 Ω and R2 = 25 Ω and I = 0.15 A, find V.

Let RP = R. If R1 = 50 Ω and R2 = 25 Ω and I = 0.15 A, find V.

Given R = 110 Ω, l = 1.0 m, and A = 22×10-6 m2 , find ρ.
3 answers 3