The net resistance of an ammeter should be small to ensure that

Options

A. (a)it does not get overheated
B. (b)it does not draw excessive current
C. (c )it can measure large currents
D. (d)it does not apperciably change the current to be measured.

Answer

**Step-by-Step Solution:**

1. **Understanding the Function of an Ammeter**: An ammeter is a device used to measure the electric current flowing through a circuit. It is essential to understand that an ammeter must be connected in series with the circuit to measure the current accurately.

2. **Connection in Series**: When an ammeter is connected in series, the total current flowing through the circuit also flows through the ammeter. Therefore, the ammeter must not significantly alter the current it is trying to measure.

3. **Impact of Resistance on Current**: According to Ohm's Law (V = IR), the current (I) flowing through a circuit is inversely proportional to the resistance (R) when the voltage (V) is constant. If the resistance of the ammeter is high, it will add to the total resistance of the circuit, leading to a decrease in the overall current flowing through the circuit.

4. **Requirement for Low Resistance**: To ensure that the ammeter does not affect the current it is measuring, its resistance must be very low. This allows maximum current to flow through the circuit without significant voltage drop across the ammeter.

5. **Conclusion**: Therefore, the net resistance of an ammeter should be small to ensure that it does not impede the flow of current in the circuit, allowing for an accurate measurement of the current.

---