The above circuit represents a charger for a lithium ion battery. The source is

Question

The above circuit represents a charger for a lithium ion battery. The source is wall electricity after it has been converted to DC. It has an internal resistance of 30 Ohm. The battery has a voltage rating of 5V and an internal resistance of lk Ohm. In order to minimize the change time, the most amount of power possible must be delivered into the 5 V source only. The power delivered into its internal resistance is lost in the form of heat. Devise an interface circuit that minimizes the charge time.

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bump again....still no answer. :(

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