A power supply has an open-circuit voltage of 36.0 V and an internal resistance of 2.00 Ω. It is used to charge two stor

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A power supply has an open-circuit voltage of 36.0 V and an
internal resistance of 2.00 Ω. It is used to charge two storage
batteries connected in series, each having an emf of 6.50 V and
internal resistance of 0.300 Ω. The charging current is to be
3.90 A.
(a) What additional resistance should be added in series? Ω
(b) At what rate does the internal energy increase in the
supply? W
(c) At what rate does the internal energy increase in the
batteries? W
(d) At what rate does the internal energy increase in the added
series resistance? W
(e) At what rate does the chemical energy increase in the
batteries? W