Ammeter

Ammeter – Electrical Current Measuring Instrument

An Ammeter is an essential electrical measuring instrument used to measure the electric current (in amperes) flowing through a circuit. It plays a crucial role in electrical testing, diagnostics, and circuit analysis, ensuring the proper functioning of electrical systems. Ammeters are commonly used in laboratories, industrial applications, and household electrical maintenance.

Types of Ammeters

Ammeters come in various types based on their working principle and application:

1. Analog Ammeter – Uses a needle and dial to display current readings. It typically operates using a moving coil or moving iron mechanism.
2. Digital Ammeter – Provides a direct numerical reading of current using electronic components and digital displays.
3. Clamp Meter (Clamp Ammeter) – Measures current without direct contact by clamping around a conductor and detecting electromagnetic fields.
4. Electromechanical Ammeter – Uses electromagnetic induction to measure current, often used in industrial applications.
5. Microammeter & Milliammeter – Specialized ammeters used to measure very small currents in microamperes (µA) or milliamperes (mA).

How an Ammeter Works

An ammeter is connected in series with the circuit so that the entire current flows through it. It has a low internal resistance to minimize voltage drop and ensure accurate measurement. When current flows through the ammeter, the device detects and displays the current value, either using an analog dial or a digital screen.