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

$P_{V}=IV$

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

$P_{R}=I^{2}R(T)$

$R(T)=R_{o}+nT$ for Conductor

$R(T)=R_{o}e^{nT}$ for Semi conductor

Hence, the actual energy transmitted

$P=P_{V}-P_{R}$

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

The efficiency of anergy transmitted

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