What type of resistance must an ammeter offer to the circuit?

An ammeter must offer low resistance to the circuit in order to accurately measure the current flowing through it while minimizing its impact on the circuit itself. When the resistance is low, the ammeter allows most of the current to pass through without causing significant voltage drop across its terminals. This ensures that the measurement of the current is as close to the actual current in the circuit as possible.

If an ammeter had high resistance, it would impede the flow of current and could lead to inaccurate readings, as well as potentially alter the behavior of the circuit. Conversely, if it offered no resistance, it could create a short circuit situation, which is unsafe. The option regarding applying a voltage is not applicable because an ammeter does not introduce voltage into the circuit; it merely measures the current flow. Thus, a low resistance is critical for the proper functioning of an ammeter in electrical circuits.