There are some assumptions you need to make to solve #8. If you explain your assumptions, you'll get full credit. If you're not sure, make the following assumptions:
(a) You can charge a battery if the current flows into the positive terminal.
(b) By charging it, you thereby increase its capacity.
(c) When a battery dies, the equivalent circuit is just a resistor in series with the zero volt source.
Here is why these assumptions are not necessarily the only ones you could make. For instance, if a cell is fully charged, it may not readily accept current and its capacity would not increase.
But in the interest of keeping things "simple", you may make the above assumptions.
(a) You can charge a battery if the current flows into the positive terminal.
(b) By charging it, you thereby increase its capacity.
(c) When a battery dies, the equivalent circuit is just a resistor in series with the zero volt source.
Here is why these assumptions are not necessarily the only ones you could make. For instance, if a cell is fully charged, it may not readily accept current and its capacity would not increase.
But in the interest of keeping things "simple", you may make the above assumptions.
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