In a torch what are the parts that are in contact made of why are they made of such materials?

In a torch, the parts that are in contact, such as the battery terminals and the bulb socket, are typically made of conductive materials like copper or brass. These materials are chosen for their Excellent electrical conductivity, which ensures efficient power transfer and minimizes energy loss. Additionally, components may be coated with materials like nickel to prevent corrosion and enhance durability, ensuring reliable performance over time. The choice of materials helps maintain a safe and effective operation of the torch.