What are the formulas in circuit theory?

Each resistor that exists in the circuit has the full voltage. According to Ohm’s law, the currents that flow via the individual resistors are I₁ = V/R₂, I₂ = V/R₂, and I₃ = V/R₃. Furthermore, conservation of charge implies that the total current happens to be the sum of these currents. I= I₁ + I₂ + I₃.