Complete the following sentences :
A fuse wire is made of an alloy of ................... If the current in a circuit exceeds the current rating of the fuse wire, it ................

Explanation

To complete the sentences provided in the question, we will follow these steps:

1. **Identify the material of the fuse wire**: A fuse wire is designed to protect electrical circuits by melting when the current exceeds a certain level. The material used for fuse wires is typically an alloy.

2. **Determine the specific alloy used**: The common alloys used for fuse wires are lead and tin. These materials have specific properties that allow them to melt easily when subjected to high temperatures caused by excessive current.

3. **Understand the function of the fuse wire**: The primary function of a fuse wire is to prevent damage to electrical circuits by breaking the circuit when the current exceeds a predetermined limit. This is achieved by the wire melting, which interrupts the flow of electricity.

...