How Do You Calculate Transformer Efficiency with Given Power and Voltage?

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Nightwatchman

Homework Statement

What is the the efficiency of a transformer with 13w of primary power.
120Vp, Np unknow
12Vs, 90Np

eff= Psec/ Pri * 100

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rl.bhat

120Vp, Np unknow
12Vs, 90Np
In first line you say Np is unknown and second line you say Np = 90. which is correct?