DC Circuit Equations
Table of Contents – Direct Current (DC) Equations
Ohm’s Law
V = IR
I = \frac{V}{R}R = \frac{V}{I}Joule’s Law
P = IV = \frac{V^2}{R} = I^2RResistors in Series and Parallel
Resistors in series increase the total equivalent resistance of the circuit:
R_{Tseries} = R_1+R_2+R_3+...+R_NResistors in parallel decrease the total equivalent resistance of the circuit:
R_{Tparallel} = \frac{1}{(\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}+...+\frac{1}{R_N})} = (\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}+...+\frac{1}{R_N})^{-1}Capacitors in Series and Parallel
Capacitors in series decrease the total equivalent resistance of the circuit:
C_{Tseries} = \frac{1}{(\frac{1}{C_1} + \frac{1}{C_2} + \frac{1}{C_3}+...+\frac{1}{C_N})} = (\frac{1}{C_1} + \frac{1}{C_2} + \frac{1}{C_3}+...+\frac{1}{C_N})^{-1}Capacitors in parallel increase the total equivalent resistance of the circuit:
C_{Tseries} = C_1+C_2+C_3+...+C_N