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 Engineering Formulae
Electricity

 Ohm's Law Electric Energy Resistivity Kirchhoff's Law Conductance Coulomb's Law Electric Power

Ohm's Law where,

I = current, amp

V = potential difference, volts

R = resistance, ohms

Resistivity where,

ρ = resistivity or specific resistance, ohm-m

L = length of wire, m

A = cross-sectional area of wire, m2

Conductance (G) where,

γ = conductivity or specific conductance, mhos/m

Electric Power where,

P = electric power, watts

Electric Energy where,             E = electric energy, Joules

V = potential difference, Volts

I  = Current, Amperes

R = resistance, ohms

t = time, seconds

E = 0.24I2Rt, cal

For Battery where Kirchhoff’s Law

(i)               The algebraic sum of all the currents directed towards a junction point is zero.

(ii)             The algebraic sum of all the voltage rise taken in a specified direction around a closed circuit is zero.

Series Circuits: Parallel Circuits: Coulomb’s Law

The force acting between two charged bodies q1 and q2 in air is proportional to the product of charges and inversely proportional to the square of the distance between them.  