electricity formulas

Density is mass per unit volume
Density = mass / volume

velocity = displacement / time

Force = rate of change of momentum

Momentum = mass . velocity

Power is rate of work done
Power = work / time
Unit of power is watt

Potential energy (P)
PE = m.g.h
m = mass
g = acceleration due to gravity (9.81m/s²)
h = height

Kinetic energy (P)
P = (1/2).m.v²
m = mass
v = velocity

Ohm’s law
V = I . R
V = voltage applied
R = Resistance
I = current

Electric power (P) = (voltage applied) x (current)
P = V . I = I² . R
V = voltage applied
R = Resistance
I = current

OPTICS
Index of refraction
n = c/v

n – index of refraction
c – velocity of light in a vacuum
v – velocity of light in the given material