Circuit Solver
The Ohm's-law wheel solved from any two knowns, series and parallel resistor networks drawn live, and Kirchhoff's laws as checkable balances. Covers §9.32–9.37.
Enter Any Two of V, I, R, P
Resistor Network
KCL — Currents at a Node
Enter currents entering as positive, leaving as negative. The sum must be zero.
KVL — Voltages Around a Loop
Sources positive, drops negative, walking one full loop.
Kirchhoff's laws are conservation statements: KCL is conservation of charge (what enters a node leaves it), KVL is conservation of energy (a charge returning to its start has gained nothing net). If your loop or node doesn't balance, a value is wrong or a sign convention slipped.