Please ans this
Q.38. Out put of a full - wave rectifier is taken across a lod of 180 Ω , the forward bias resistances of the diodes used are 20 Ω each. Find the efficiency of rectification of a.c. power into dc power
1) 63.4 %     2) 73.08 %       3) 37.00 %         4) 100 %

Dear Student ,
As we know that ,

Efficiency of rectification of ac power to dc power=η=0·8121+2RFRL=0·8121+2×20180=0·812×180220=0·664So percentage of efficiency=η×100%=66·4%
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