Common formulas

Here are some formulas used in circuit analysis: 
(I is for current, V is for voltage, R is for resistance, Q is for charge, t is for time, G is for conductance, and C is for capacitance.)

Ohm’s law         V = IR; I= V/R; R= V/I

Power                P = IV; P = V^2/R; P= I^2(R)

Charge              Q = It;

Conductance     G = 1/R 

Capacitance      C = Q/V