A $15$ KVA, $720/240-$V$,60$ Hz$,$ single$-$phase conventional transformer is supplying

$12\mathrm{.}5$ KW power to a load at $0\mathrm{.}85$ Lagging power factor, and a load voltage of $240$ Volts.

If $I_S=61\mathrm{.}27$llcorner$-31\mathrm{.}79$ Amperes, and $V_s=240$llcorner$0$ Volts, Calculate the following:

The Voltage Regulation is: $\%$VR $=\%.$

The output power $P_{\text{o}\text{u}\text{t}}=$ Watt.

The Copper Losses Pcu $=$ Watt.

The Core Losses

$P_{\text{c}\text{o}\text{r}\text{e}}=$

$$ Watt.

The efficiency of the transformer is $\%n=\%.$