The characteristics of fuse wire is:

Options

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

Answer

To answer the question about the characteristics of fuse wire, we can break it down step by step:

### Step 1: Understanding Fuse Wire
- **Definition**: A fuse wire is a safety device used in electrical circuits to prevent excessive current flow, which can cause overheating and potential damage to the circuit or appliances.

### Step 2: Characteristics of Fuse Wire
- **Thin Wire**: Fuse wires are typically made of a thin metal wire. This design allows them to heat up quickly when current flows through them.

### Step 3: Melting Point
- **Low Melting Point**: The most important characteristic of a fuse wire is that it has a low melting point. This is crucial because when the current exceeds a certain level, the wire heats up and melts, breaking the circuit and stopping the flow of electricity.

### Step 4: Resistivity
- **Low Resistivity**: While fuse wires do have some resistivity, it is not a defining characteristic. The primary focus is on the melting point.

### Conclusion
- The characteristic of fuse wire is that it has a **low melting point**. This allows it to act quickly in protecting electrical circuits from overload.

### Final Answer
The characteristic of fuse wire is a **low melting point**.

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