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The primary function of an ammeter is to measure current, which is the flow of electric charge in a circuit. Ammeters are specifically designed to be connected in series within an electrical circuit, allowing them to measure the amount of current flowing through the circuit without significantly disrupting the flow of electricity.

Current measurement is essential in various applications to ensure that electrical devices are operating within their specified parameters. By providing a direct measurement of current, ammeters help in diagnosing issues in electrical systems, ensuring safety, and optimizing performance. Understanding how current behaves within a circuit is crucial for anyone studying electronics or electrical engineering, as it impacts the overall functionality and efficiency of electrical systems.

In contrast, devices designed to measure voltage, resistance, or capacitance serve different purposes; voltage meters (voltmeters) measure the potential difference between two points, ohmmeters measure resistance, and capacitance meters gauge the ability of a component to store charge. Each of these instruments provides unique information that is integral to understanding an electrical system, but it is the ammeter that specifically focuses on current measurement.