watch "non$-$ideal transformer $-$ sample problem" which looks at a transformer with $110$ loops on the primary side and $880$ on the secondary$.$ a$)$ if you have $6\mathrm{.}7$V as input, what is the expected output voltage? b$)$ if you have $4\mathrm{.}1$ A on the primary, what is the expect output current? c$)$ determine the input and output power for this transformer d$)$ determine the efficiency of the transformer