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 256 mA is used to charge them. The wall socket provides a voltage of 120 V.

(a) Determine the turns ratio of the transformer.
Ns/Np=.

(b) What is the current coming from the wall socket?
Ip = .

(c) Find the average power delivered by the wall socket and the average power sent to the batteries.
Pp = .
Ps = .

Explanation / Answer

a) Ns/Np= 9/120 b) 9*0.207=120*Ip, Ip = 15 mA Pp= 1.863 W Ps= 1.863 W

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