Ohm's Law

V = I x R
I = V ÷ R
R = V ÷ I

UNITS
V = Voltage (Volts, V)
I = Current (Amperes, A)
R = Resistance (Ohms, Ω)

Ohm's Law with Power Equations

Voltage (V)

Ohm's Law:  V = I x R
In terms of power:  V = √ P x R ,  V = P ÷ I

Current (I)

Ohm's Law:  I = V ÷ R
In terms of power:  I = P ÷ V,  I = √ P ÷ R 

Resistance (R)

Ohm's Law:  R = V ÷ I
In terms of power:  R = P ÷ I²,  R = V² ÷ P

Power (P)

P = I² x R,  P = V² ÷ R,  P = V x I