Transformer Utilization Factor (T.U.F) of a rectifier circuit is defined as the ratio of the DC power available at the load resistor and the AC rating of the secondary coil of the transformer.
T . U . F = P o d c V A r a t i n g o f T r a n s f o r m e r {\displaystyle T.U.F={\frac {P_{odc}}{V_{A}\ rating\ of\ Transformer}}}
The V A {\displaystyle V_{A}} rating of the transformer can be defined as: V A = V r . m . s I ˙ r . m . s ( F o r s e c o n d a r y c o i l . ) {\displaystyle V_{A}=V_{r.m.s}{\dot {I}}_{r.m.s}(For\ secondary\ coil.)}
