Question

Solder, an alloy of lead and tin, is used for welding electrical wires.

Hint:

Solder has low melting point and good conductivity, ideal for joining wires.

Answer 1

Reason: Solder (Alloy of Lead and Tin) is Used for Welding Electrical Wires

Solder is an alloy made mainly of lead (Pb) and tin (Sn). It is widely used for joining or welding electrical wires because of its special physical and chemical properties.

Detailed Explanation:

1. Low Melting Point:
Solder has a much lower melting point compared to most metals used in electrical wires (like copper). Because of this, it melts easily when heated and flows into the gap between wires, forming a strong joint without damaging the wires.

2. Good Electrical Conductivity:
Since solder is made of metals, it conducts electricity well. This ensures that the electrical connection between wires remains efficient.

3. Strong and Durable Joint:
After melting and cooling, solder solidifies quickly and forms a firm and permanent connection between the wires.

4. Prevents Oxidation:
The soldered joint reduces exposure of the wire ends to air and moisture, thereby preventing rusting or corrosion.

Conclusion:
Solder, an alloy of lead and tin, is used for welding electrical wires because it has a low melting point, good electrical conductivity, and forms strong, durable connections without damaging the wires.