A storage battery of emf 8V and internal resistance 0.5 ohm is being charged by a 120 V d.c supply using a series resistor of 15.5 ohm. What is the terminal voltage of the battery during charging? what is the purpose of having a series resistor in the charging ciruit?

https://www.meritnation.com/ask-answer/question/a-battery-of-emf-8v-and-internal-resistance-r-0-5-ohm-is-bei/current-electricity/2451148

The link provides a solution to the numerical.

A series resistor is used in a circuit to limit the current supplied.

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