# 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/s^{2})

h = height

**Kinetic energy (P)**

P = (1/2).m.v^{2}

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 = I^{2} . 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

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- Created by: pankhudi
- Created on: 12-08-12 12:38

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