What characteristics should a fuse wire have?

Options

A. high melting point, high specific resistance
B. low melting point, low specific resistance
C. high melting point, low specific resistance
D. low melting point, high specific resistance

Explanation

### Step-by-Step Solution:

1. **Understanding the Purpose of a Fuse Wire**:
- A fuse wire is used in electrical circuits to prevent damage to appliances by breaking the circuit when the current exceeds a safe level.

2. **Characteristics of a Fuse Wire**:
- The fuse wire must have specific characteristics to function effectively. The two main characteristics are:
- **Low Melting Point**: This allows the fuse to melt quickly when a high current flows through it, thus breaking the circuit and preventing damage.
- **High Specific Resistance**: A high resistance means that the fuse wire will heat up more quickly when current flows through it, which contributes to its ability to melt under excessive current conditions.

3. **Conclusion**:
- Therefore, the characteristics that a fuse wire should have are:
- **Low Melting Point**
- **High Specific Resistance**

### Final Answer:
A fuse wire should have a low melting point and high specific resistance.

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