Power

Given the magnitudes of V and I, power can be calculated as the product of the 2 quantities and is measured in Watts (W).

Mathematically

 

Example

If power dissipated in the circuit element is 100 W and a current of 10 A is flowing through it, calculate the voltage across and resistance of element.

 

Alternate Expressions for the Power Using Ohm's Law

Using Ohm's law that is V _IR, 2 more useful expressions for the power absorbed/delivered can be derived as follows
 

Example

A light bulb draws 0.5 A current at the input voltage of 230 V. Determine resistance of the filament and also power dissipated.

From Ohm's law

 

Since a bulb is a resistive purely load, thus all the power is dissipated in the form of heat. This can be calculated by using any of the 3 power relationships stated above

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