An **ammeter** is a device used to measure the **current** flowing through a circuit. The unit of measurement for current is **amperes (A)**, which is where the name "ammeter" comes from.
When you want to know how much electric charge is flowing through a conductor or a component, you use an ammeter to measure the **amount of electric current**.
### How it works:
* To measure current, an ammeter is always connected **in series** with the circuit, meaning the current flows through the ammeter.
* It has very low resistance so it doesn't affect the current flow significantly.
### Types of Ammeter:
1. **Analog ammeter**: Shows current on a scale with a needle pointing to a value.
2. **Digital ammeter**: Displays the current on a digital screen.
Ammeter readings can help in analyzing the behavior of a circuit, ensuring everything is working correctly, or detecting any problems like excessive current.