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November 24, 2014

November 24, 2014

Posted by **Justin** on Tuesday, May 29, 2012 at 8:53pm.

Here is the problem I have to solve:

A protable CD player requires 12 volts to operate. A transformer allows the device to be powered from a 120-volt outlet. If the primary has 500 turns, how many turns should the secondary have?

This is how I set it up:

(primary voltage)/(number of primary turns) = (secondary voltage)/(number of secondary turns)

12/500 = 120/5000

but I have no idea if I am on the right track!

- Physics - Help!!! -
**Elena**, Wednesday, May 30, 2012 at 7:25amU1/U2 =N1/N2

N2 =N1•U2/U1 =500•12/120 = 50

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