Various power stages in the case of a d.c generator are shown below

Following are the three gnerator efficiencies

It is obvious that overall efficiency is the product of mechanical and electrical efficiencies. For good generators,its value may be as high as 95%.

In general generator efficiency = Output / (Output + losses)

The condtion for maximum efficiency of generator is given by

Following are the three gnerator efficiencies

**1. Mechanical Efficiency****2. Electrical Efficiency****3.Overall or Commercial Efficiency**It is obvious that overall efficiency is the product of mechanical and electrical efficiencies. For good generators,its value may be as high as 95%.

**Condition for Maximum Efficiency**In general generator efficiency = Output / (Output + losses)

The condtion for maximum efficiency of generator is given by

**i.e Variable loss = Constant loss.**
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