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The adaptor used to charge most portable electronic devices contains a small step-down transformer, which converts the 120 V (rms) household voltage into a less dangerous and more useful voltage. Suppose that the transformer has a winding ratio of 13:1 and draws 0.323 A of current (rms) from the wall outlet.The adaptor used to charge most portable electronic devices contains a small step-down transformer, which converts the 120 V

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20 V TVs = 9.23 V (38) - P = Up [p = Ve Is (120) (-323A) = (9.23v) (Is) Is = 4.2A 6 = Velo = (120v) (0.321A) P = 38.86

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