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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

ohm's law

where,   

            I = current, amp

            V = potential difference, volts

            R = resistance, ohms

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Resistivity

resistivity

where,           

                        ρ = resistivity or specific resistance, ohm-m

                        L = length of wire, m

                        A = cross-sectional area of wire, m2

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Conductance (G)

conductance

where,          

                     γ = conductivity or specific conductance, mhos/m

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Electric Power

electric power

where,                   

                   P = electric power, watts

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Electric Energy

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

   electric energy for battery

where

          electric energy for battery

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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:

series circuits

Parallel 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.

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