The rechargeable batteries for a laptop computer need a much smaller voltage tha

Question

The rechargeable batteries for a laptop computer need a much smaller voltage than what a wall socket provides. Therefore, a transformer is plugged into the wall socket and produces the necessary voltage for charging the batteries. The batteries are rated at 9.0 V, and a current of 232 mA is used to charge them. The wall socket provides a voltage of 120 V.

(a) Determine the turns ratio of the transformer.

=  

(b) What is the current coming from the wall socket?
Ip =   ---Select--- A Ohm W C V

(c) Find the average power delivered by the wall socket and the average power sent to the batteries.
Pp =   ---Select--- Ohm W V A C
Ps =   ---Select--- Ohm V W C A

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Additional Materials

Section 22.9

Explanation / Answer

(a)   Transformer ratio is, Np / Ns =  Vp / Vs =  Is / Ip = 120 / 9 = 13.33

   (b) so, Vp / Vs =  Is / Ip , then we get

I p = Is / 13.33 = 232 /13.33 mA = 17.4 m A

    (c) the values, P p = Ps = Vp Ip = (120)(17.4 x10-3) = 2.088 W

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