Which of the following has the maximum resistance ?

Options

A. Voltmeter
B. Millivoltmeter
C. Ammeter
D. Miliammeter

Answer

To determine which of the following devices has the maximum resistance, we need to analyze the characteristics of each device mentioned: voltmeter, ammeter, and milliammeter.

### Step-by-Step Solution:

1. **Understanding the Devices**:
- **Ammeter**: An ammeter is designed to measure current and is connected in series in a circuit. Ideally, it has zero resistance (R = 0) to avoid affecting the current flow.
- **Voltmeter**: A voltmeter measures voltage and is connected in parallel across a component. Ideally, it has infinite resistance (R = ∞) to prevent drawing current from the circuit.
- **Milliammeter**: A milliammeter is a type of ammeter that measures current in milliamperes. Like an ammeter, it also has low resistance.

2. **Comparing Resistances**:
- Since an ideal ammeter has the least resistance (R = 0), it is out of the running for maximum resistance.
- A milliammeter, being a type of ammeter, also has low resistance.
- A voltmeter, on the other hand, has high resistance, and in practical scenarios, it has a resistance much greater than that of an ammeter or milliammeter.

3. **Conclusion**:
- Among the three devices, the voltmeter has the highest resistance. Therefore, the answer to the question is that the voltmeter has the maximum resistance.

### Final Answer:
The device with the maximum resistance is the **voltmeter**.