A storage battery of emf 8.0 V and internal resistance `0.5 Omega` is being charged by a 120V dc supply using a series resistor of `15.5Omega` what in the terminal voltage of the battery during charging ? What is the purpose of having a series resistor in the charging circuit?

Explanation

To find the terminal voltage of the battery during charging, we can follow these steps:

### Step-by-Step Solution

1. **Identify Given Values**:
- EMF of the battery (E) = 8.0 V
- Internal resistance of the battery (r) = 0.5 Ω
- External resistor (R) = 15.5 Ω
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