# Fundamental Physics/Electronics/Power

## Power

Energy generated from voltage source to produce a current flows in a conductor . This energy can be calculated by Watt's law

${\displaystyle P_{V}=IV}$

Since there will be heat energy generated from conductor's resistance which is considered as Electric energy loss

${\displaystyle P_{R}=I^{2}R(T)}$
${\displaystyle R(T)=R_{o}+nT}$ for Conductor
${\displaystyle R(T)=R_{o}e^{nT}}$ for Semi conductor

Hence, the actual energy transmitted

${\displaystyle P=P_{V}-P_{R}}$
${\displaystyle P=IV-I^{2}R=I(V-IR)}$

The efficiency of anergy transmitted

${\displaystyle n={\frac {P}{P_{V}}}={\frac {I(V-IR)}{IV}}={\frac {V-IR}{V}}}$