Find the values of (r₁) to satisfy each of the following conditions:
9.1) (V = 3V);
9.2) (V = 0V);
9.3) (I = 3A);
9.4) The power dissipated in (r₁) is 12W.

a) (r₁ = {1}/{3}) ohm
b) (r₁ = 4) ohms
c) (r₁ = 2) ohms
d) (r₁ = 6) ohms