Cathodic Protection Tester Practice Exam

What is found between the leads of an ammeter internally?

1. High resistance

2. Low resistance

3. No components

4. Capacitance

The correct answer is: Low resistance

An ammeter is designed to measure the current flowing through a circuit, and it is essential for it to allow current to pass with minimal interruption. Internally, an ammeter is constructed with low resistance. This design ensures that it does not significantly affect the overall circuit when measuring current. When an ammeter is connected in series with a circuit, its low resistance allows the majority of the current to flow through it, ensuring an accurate reading of the current in the circuit. High resistance would impede the flow of current and potentially lead to inaccurate measurements, while having no components at all would also be ineffective for current measurements. Capacitance is not a characteristic related to a typical ammeter's internal structure, as it does not play a role in the direct measurement of current. Thus, the internal low resistance of an ammeter is crucial for its function in electrical measurements, making it the correct choice in this context.