Electronics Principles V11

Clive W. Humphris

DC POWER: DC Power V and I.  


Power is the work done when electrons flow through a circuit.

In a good conductor there are lots of free electrons and so little power is consumed. However, when resistance is present, work has to be done to release sufficient electrons for the required current to flow. This generates heat as wasted energy.

By combining Ohm's Law and the formula for finding circuit power P then twelve resulting equations can be developed.

Select the appropriate formula to determine the power rating of a resistor in a DC circuit.


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