The charger for your electronic devices is a transformer. Suppose a 60 Hz outlet voltage of 120 V needs to be reduced to a device voltage of 3.0 V. The side of the transformer attached to the electronic device has 70 turns of wire.
How many turns are on the side that plugs into the outlet?

number of turns attached to the side that plugs into the outlet is 2800 turns of wire.

Explanation:

Given;

outlet voltage, V₁ = 120 V

inlet voltage, V₂ = 3.0 V

number of turns of wire attached to the inlet voltage, N₂ = 70 turns of wire.

number of turns of wire attached to the outlet voltage, N₁ = ?

Determine number of turns of wire attached to the outlet voltage based on turn ratio;

V₁ / V₂ = N₁ / N₂

120 / 3 = N₁ / 70

40 = N₁ / 70

N₁ = 40 x 70

N₁ = 2800 turns of wire

Therefore, number of turns attached to the side that plugs into the outlet is 2800 turns of wire.

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