Before revision: The efficiency is the ratio of power dissipated by the load resistance to power dissipated by the voltage source's resistance of : Consider three particular cases: If , then Efficiency approaches 0% if the load resistance approaches zero (a short circuit), since all power is consumed in the source and no power is consumed in the short.
After revision: totalcircuit (which includesas well as )The efficiency is the ratio of power dissipated by the load resistance to power dissipated by the voltage source's resistance of : Consider three particular cases: If , then Efficiency approaches 0% if the load resistance approaches zero (a short circuit), since all power is consumed in the source and no power is consumed in the short.