RMS Current Help: What is the Primary Coil's Current in a Transformer?

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SUMMARY

The primary coil of a transformer connected to a 130 V/60 Hz outlet has an RMS current that can be calculated using the formula I = P/V. Given that the secondary coil dissipates 64 W, and assuming the transformer is ideal, the power input to the primary coil is also 64 W. Therefore, the RMS current in the primary coil is calculated as I = 64 W / 130 V, resulting in approximately 0.492 A.

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Homework Statement


The primary coil of a transformer is connected to a 130 V/60 Hz wall outlet. The secondary coil is connected to a lamp that dissipates 64 W. What is the rms current in the primary coil?


Homework Equations





The Attempt at a Solution


I = P/V
but I don't have P for the primary
 
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If the transformer is ideal then the power output is the same as the power input.
 
So it is 64W??
 

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