1 Answer
The unit of a galvanometer is typically expressed in **amperes (A)**, because a galvanometer is an instrument used to measure small electric currents. However, a more specific unit isn't always assigned directly to galvanometers, as they are usually calibrated to indicate current in amperes (or milliamperes, mA) when connected to a circuit.
Instead of a unit, a galvanometer is rated by its **full-scale deflection current**. This is the amount of current that will make the needle or dial of the galvanometer move to its maximum reading. For example, a galvanometer might have a full-scale deflection current of 1 mA, which means it shows the maximum deflection when 1 milliamperes of current flows through it.
In summary:
- **Unit of current measured by a galvanometer**: amperes (A)
- **Typical range**: milliamperes (mA) for most common galvanometers.
Instead of a unit, a galvanometer is rated by its **full-scale deflection current**. This is the amount of current that will make the needle or dial of the galvanometer move to its maximum reading. For example, a galvanometer might have a full-scale deflection current of 1 mA, which means it shows the maximum deflection when 1 milliamperes of current flows through it.
In summary:
- **Unit of current measured by a galvanometer**: amperes (A)
- **Typical range**: milliamperes (mA) for most common galvanometers.