Suppose a transformer in a cell-phone charger is used to generate an output AC v

Question

Suppose a transformer in a cell-phone charger is used to generate an output AC voltage of 2.5V RMS from the input AC voltage delivered from the wall socket (120 V RMS).

a. If the secondary has 20 turns, how many turns does the primary have?

b. If the current of 0.7 A RMS flows in the secondary, what is the amplitude of the sinosoidal current flowing in the primary?

c. If the cell phone is equivalent to a resistive load of 10 ohms, what is the amplitude of the sinusoidal current flowing in the primary?

Explanation / Answer

A.

As

n1 = n2 V1 / V2

Then

n1 = 960 [ANSWER]

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As

I1 = n1 I2 / n2

Thus,

I1 = 33.6 A [ANSWER]

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