A typical wall outlet voltage in the United States is 120 volts. Personal MP3 players require much smaller voltages, typically 487.0 mV 487.0 mV . If the number of turns in the primary coil is 2464 2464 , calculate the number of turns on the secondary coil of the adapter transformer.

Number of turns on the secondary coil of the adapter transformer is 10.

Explanation:

For a transformer,

where is the voltage induced in the secondary coil

            is the voltage in the primary coil

          is the number of turns of secondary coil

          is the number of turns of primary coil

From the given question,

    =

⇒     =

            = 9.999733

  ∴   = 10 turns

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