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October 23, 2014

Homework Help: Physics - Help!!!

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

I am having trouble understanding transformers!!
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!

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