EveryCircuit is cool and all, but what if you had to analyze a circuit by pen and paper.
One method is to first simplify circuit A by merging resistors connected in series or in parallel:
B. Resistors in series: 3 Ω + 3 Ω = 6 Ω
C. Resistors in parallel: 3 Ω || 6 Ω = 2 Ω
D. Resistors in series: 3 Ω + 2 Ω = 5 Ω
Now that we have a very simple equivalent circuit D, we can start computing voltages and currents using Ohm's law and work our way back to the original circuit A:
D. Calculate current: 30 V / 5 Ω = 6 A
C. Calculate voltage: 2 Ω × 6 A = 12 V
B. Calculate current: 12 V / 3 Ω = 4 A
B. Calculate current: 12 V / 6 Ω = 2 A
A. Calculate voltage: 3 Ω × 2 A = 6 V
That's all.
