Circuit Solver

Ohm's Law: V = IR

Enter any two values to calculate the third

Series & Parallel Resistors

Voltage & Current Dividers

Voltage Divider

Current Divider

Power Calculations: P = VI = I²R = V²/R

Time Constants

RC Circuit: τ = RC

RL Circuit: τ = L/R

Quick Reference

Ohm's Law

V = IR

Power

P = VI = I²R = V²/R

Series Resistors

R_total = R1 + R2 + ...

Parallel Resistors

1/R_total = 1/R1 + 1/R2 + ...

Voltage Divider

Vout = Vin × R2/(R1+R2)

Time Constant

τ = RC or τ = L/R