A step$-$up transformer is designed to have an output voltage of

$2200$

V $($rms$)$ when the primary isconnected across a $110-$V $($rms$)$ source.

$($a$)$ If the primary winding has exactly

$78$

turns, how many turns are required on the secondary$?$

$1560$

turns

$($b$)$ If a load resistor across the secondary draws a current of

$1\mathrm{.}60$

A$,$ what is the current in theprimary, assuming ideal conditions?

$32$

A

$($c$)$ If the transformer actually has an efficiency of

$98\mathrm{.}0$

$\%$

$,$ what is the current in the primarywhen the secondary current is $1\mathrm{.}20$ A$?$

$24\mathrm{.}50$

A

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