Hey how would I solve this?? The rechargeable batteries for a laptop computer ne
ID: 1676801 • Letter: H
Question
Hey how would I solve this?? The rechargeable batteries for a laptop computer need a muchsmaller voltage than what a wall socket provides. Therefore, atransformer is plugged into the wall socket and produces thenecessary voltage for charging the batteries. The batteries arerated at 9.0 V, and a current of 196 mAis used to charge them. The wall socket provides a voltage of120 V. (a) Determine the turns ratioof the transformer. (b) What is the current comingfrom the wall socket? (c) Find the average powerdelivered by the wall socket and the average power sent to thebatteries. Thank you! Hey how would I solve this?? The rechargeable batteries for a laptop computer need a muchsmaller voltage than what a wall socket provides. Therefore, atransformer is plugged into the wall socket and produces thenecessary voltage for charging the batteries. The batteries arerated at 9.0 V, and a current of 196 mAis used to charge them. The wall socket provides a voltage of120 V. (a) Determine the turns ratioof the transformer. (b) What is the current comingfrom the wall socket? (c) Find the average powerdelivered by the wall socket and the average power sent to thebatteries. Thank you!Explanation / Answer
Given V ‘ = 9 V
I‘ = 196 mA = 0.196 A
V =120 V
Ratio of truns N / N ‘ = V / V ‘
= 120 / 9 = 13.333
(b). current coming from the wall socket I = ?
We know I / I ‘ = N ‘ / N
From this I = N ‘ I ‘ / N
= 14.7 mA = 0.0147 A
(c). Average power delivered by the wall socket P = VI=1.764 W
the average power sent to the batteries P ‘ = V ‘ I‘ = 1.764 W