Which of the following statements are correct?
(i) Tin – lead alloy is used for making fuse wires.
(ii) Fuse is connected to live wire.
(iii) The material chosen for making fuse should have high melting point.

Correct option is B

Both (i) and (ii)

The correct statements are:

• (i): Tin-lead alloy is used for making fuse wires. This is correct because tin-lead alloys have low melting points, which is an essential characteristic for a fuse wire. Fuse wires are designed to melt and break the circuit when excessive current flows through it, protecting the rest of the electrical system.
• (ii): The fuse is connected to the live wire. This is also correct, as the fuse needs to be in the live wire to break the circuit and stop the flow of current when an overload occurs. It ensures that the dangerous high voltage is cut off from the device.

However, (iii) is incorrect. The material chosen for making a fuse should have a low melting point, not a high one. This ensures that the fuse melts quickly when there is a surge in current, providing timely protection.

Important Key Points:

1. Fuse wires are typically made from alloys like tin-lead because of their low melting point.
2. A fuse is always connected to the live wire to cut off the electrical supply during overloads or short circuits.
3. The melting point of the fuse material should be low, ensuring quick response to excessive current.
4. The purpose of the fuse is to protect electrical appliances by breaking the circuit during abnormal conditions.
5. A fuse is an essential component in electrical safety systems in households and industries.
6. Tin-lead alloys are chosen for their ability to provide consistent performance as fuse materials.

Information Booster:

• Tin-lead alloy (Option i): Used for fuse wires due to its low melting point.
• Fuse connected to live wire (Option ii): Essential for stopping the current from flowing to the appliance.
• High melting point (Option iii): Incorrect, as fuses require low melting points to work effectively.