Electricity Formulas


Electricity is the flow of charge from anode to cathode in a conductor. This current provides power to the electrical devices. To understand how the electricity works we need to know the various parameters related to it and the relation between them.


Quantity
Symbol
Unit
Symbol
Electrical potential, voltage
V
Volts
v
Electric Resistance
R
Ohms
Ω
Current
I
Amperes
A
Electrical energy
E
Jules
J   
(also Kwh)
Electrical power
P
Watts
W


















Ohm’s Law 


The relationship between Voltage, Current and Resistance was firstly discovered by the German physicist Georg Ohm. Georg Ohm found that, at a constant temperature, the electrical current flowing through a resistance is directly proportional to the voltage applied across it, and inversely proportional to the resistance.
Ohm's law can be expressed as:


V = IR            I = V/R          I =V/R 




The three quantities can be represented into a triangle that can be used to calculate all formulas easily.
You hide with a finger the value to be calculated and then the other two values show how to do the calculation


Electric Energy and Electrical Power


 Power is consumption of energy by consumption of time.     P = E/t 

The formula for electrical power can be also found as:     P = VI 





Again, the three quantities have been superimposed into a triangle. It gives us the different combinations of the same equation to find the various individual quantities:





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