Because commonly we say : some hardware (e.g. transformer, speaker etc.) has XX Watts which corresponds to Real(Active) power (usually the only one measured by old traditional counters) but we have...
The transformer has two types of losses :a. copper lossb. core lossAs we know Copper loss is totally depends on the current of the transformer and the core losses depends on voltage of the...
to calculate kva rating of single phase transformer: kva rating= Q =Vp * Ip * 10^-3where,Vp= terminal voltage of primary windingIp= current of primary windingso,Q = V * I *10^-3 =2.22 * f * phi *Kw...