An ammeter is a device used to measure current flowing in a branch of a circuit. It is always connected in ………….with the branch in which the current is to be measured.

Answer

To solve the question regarding the connection of an ammeter in a circuit, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Function of an Ammeter**:
An ammeter is a device that measures the current flowing through a circuit. It is crucial to connect it correctly to obtain accurate readings.

2. **Connection Options**:
There are two primary ways to connect electrical components in a circuit: in series and in parallel. We need to determine which connection is appropriate for an ammeter.

3. **Series Connection**:
When an ammeter is connected in series with a circuit branch, it allows the same current to flow through it as in the rest of the circuit. This ensures that the reading on the ammeter reflects the actual current flowing through that branch.

4. **Parallel Connection**:
If an ammeter were to be connected in parallel with a branch, the current would split between the ammeter and the other branches. This would lead to an inaccurate reading because the ammeter would only measure a portion of the total current, not the full current flowing through the branch.

5. **Conclusion**:
Therefore, to measure the current accurately, an ammeter must always be connected in series with the branch in which the current is to be measured.

### Final Answer:
An ammeter is always connected in **series** with the branch in which the current is to be measured.

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