The main functionality of Resistor is either opposes or restricts the flow of electric current.Hence, the resistors are used in order to limit the amount of current flow and / or dividing (sharing) voltage. Let the current flowing through the resistor is I amperes and the voltage across it is V volts. The symbol of resistor along with current, I and voltage, V are shown in the following figure.
According to Ohm’s law, the voltage across resistor is the product of current flowing through it and the resistance of that resistor. Mathematically, it can be represented as
Where, R is the resistance of a resistor.
From Equation 2, we can conclude that the current flowing through the resistor is directly proportional to the applied voltage across resistor and inversely proportional to the resistance of resistor.
Power in an electric circuit element can be represented as
So, we can calculate the amount of power dissipated in the resistor by using one of the formulae mentioned in Equations 3 to 5.
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electrical
