Details

Voltage [V] 
The measure of the power differental between two points. It is the electromotive force. This is measured in volts [V]. 
Current Iintensity
[I] 
The flow of electric charge across a surface. This is measured in amps [A]. 
Power
[P] 
The rate of energy transfer. This is measured in watts [W]. 
Resistance
[R] 
The rate of energy transfer. This is measured in ohms [Ω]. 

Formulas

To find 
Known 
Formula 
Volts 
Amps [I]
Resistance Ω

V = I x R

Volts 
Watts [P]
Amps [I]

V = ^{P}⁄_{I}

Volts 
Watts [P]
Resistance Ω

√ P x R

Amps [I]

Volts
Resistance Ω

I = ^{V}⁄_{R}

Amps [I]

Watts [P]
Volts

I = ^{P}⁄_{ V}

Amps [I]

Watts [P]
Resistance Ω

I = √ ^{P}⁄_{R}

Watts [P]

Volts
Amps [I]

P = V x I 
Watts [P]

Volts
Resistance Ω

P = ^{V2}⁄_{R} 
Watts [P]

Amps [I]
Resistance Ω

P = I^{2} x R 
Resistance Ω

Volts
Amps [I]

R = ^{V}⁄_{I}

Resistance Ω 
Volts
Watts [P]

R = ^{V2}⁄_{P} 
Resistance Ω 
Watts [P]
Amps [I]

R = ^{P}⁄_{I2} 
