Question

A step-down transformer is used for recharging the batteries of portable electronic devices. The turns ratio N₂/N₁ for a particular transformer used in a DVD player is 1:10. When used with 120-V (rms) household service, the transformer draws an rms current of 38.0 mA from the house outlet.

(a)

Find the rms output voltage (in V) of the transformer.

V

(b)

Find the power (in W) delivered to the DVD player.

W

(c)

What If? What would be the current (in mA) drawn from the house outlet if the transformer had an efficiency of 88.0%, but the power delivered to the Blu-ray player remains the same?

mA

Answer 1

N2 10 VE 120 V 38 mt . 7, ། NA (a) we have 7 Vz v Vz 120v = ㅗ 10 V2= 12v n رط) N2 1 I, Bond ㅗ Iz = 0.38 A I 2= 380 mA P2 = I 2 2 (12v) (0.38)A 14.56 W if (C) 1,- ? h=88). 20.88 P2=0.8&P, -5.18w 0.88² 4.56 Sul PL Pir P 5.18 1200 -0.0432 I,= 48.2 na

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