Transformer utilization factor

Transformer utilization factor (TUF) 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 a 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

The 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 . )