Fuse wire is a wire of :

Options

A. low resistance and low melting point
B. low resistance and high melting point
C. high resistance and high melting point
D. high resistance and low melting point

Answer

To solve the question about the characteristics of fuse wire, we will analyze the two key properties: resistance and melting point.

### Step-by-Step Solution:

1. **Understanding Fuse Wire**: A fuse wire is a safety device used in electrical circuits to prevent excessive current flow which can cause damage or fire.

2. **Melting Point**:
- The melting point of fuse wire should be **low**.
- **Reason**: A low melting point allows the fuse to melt quickly when there is an overcurrent. This quick melting is essential to break the circuit and protect the appliances connected to it from damage.

3. **Resistance**:
- The resistance of the fuse wire should be **high**.
- **Reason**: A high resistance in the fuse wire ensures that when current flows through it, it generates a significant amount of heat. This heat is what causes the wire to reach its melting point quickly during an overload situation. If the resistance were low, the heat generated would be insufficient to melt the wire, and it would not serve its purpose effectively.

4. **Conclusion**: Therefore, the characteristics of fuse wire can be summarized as:
- **Low melting point**: To ensure it melts quickly during an overload.
- **High resistance**: To generate enough heat to trigger the melting process.

### Final Answer:
Fuse wire is a wire of **high resistance** and **low melting point**.

---