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## Homework Statement

The primary coil of an ideal transformer is connected to a 120-V source and draws 1.0 A. The secondary coil has 600 turns and supplies an output current of 5.0 A to run an electrical device.

A) What is the voltage across the secondary coil?

B) How many turns are in the primary coil?

**C) If the maximum power allowed by the device (before it is destroyed) is 210 W, what is the maximum input current to this transformer?**

## Homework Equations

V2=V1I1/I2

N1=N2I2/I1

and ??? I=P/V ????

## The Attempt at a Solution

I found part A) to be V2=24, and part B) to be N1=3000. The only equation I can think of for part C) is I=P/V. P is given to be 210 W. I tried plugging V1 and V2 in that equation and haven't gotten the right answer. Can someone given me an idea how to go about this? I can't find anything in the text.