Physics - Help!!!

posted by .

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!

  • Physics - Help!!! -

    U1/U2 =N1/N2
    N2 =N1•U2/U1 =500•12/120 = 50

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    1. x-ray machine operates at 200 kv with a current of 10 mA. The power mus be produced by a transformer which raises the voltage from 220 volts to 200 kilovolts. The power going into and out of the transformer is the same. How much …
  2. Physics

    This question really has me stumped and I don't know why, I seem to have forgotten the process . . . A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should …
  3. Physics

    A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120 V household circuit?
  4. college

    A device uses an AC voltage of 4320 V, which is obtained from a standard 120.0 V outlet by means of a transformer. If the primary coil has 21 turns, how many turns are in the secondary coil?
  5. Physics

    A portable 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?
  6. physics

    An appliance transformer-converter is plugged into a 120 volt AC house outlet. The primary coil has 200 windings of copper wire. The secondary coil has 15 windings of wire. Calculate the voltage output of the transformer-converter.
  7. physics. help!

    An appliance transformer-converter is plugged into a 120 volt AC house outlet. The primary coil has 200 windings of copper wire. The secondary coil has 15 windings of wire. Calculate the voltage output of the transformer-converter.
  8. Physics

    A laptop computer requires 24 volts to operate properly. A transformer with 500 turns in the primary needs to have how many turns in the secondary to operate the computer from a 120 V source?
  9. Transformers

    Two 6600/ 250 V transformers have the following short circuited characteristics: Applied voltage 200 V, current 30 A, power input 1200 W for one of the transformers; the corresponding data for other transformer being 120 V, 20 A and …
  10. physics

    An electrical device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?

More Similar Questions