A material is a conductor if it allows electric current to flow through it easily. One way to tell if a material is a conductor is by testing its electrical conductivity using a conductivity meter or by observing if it conducts electricity when connected to a circuit.
Copper is widely used for electrical materials because it is an excellent conductor of electricity. It has low resistance and can carry a high amount of electrical current without overheating or losing too much energy. Copper is also abundant, easy to work with, and has good durability and corrosion resistance.
The conductivity of materials can be affected by various factors such as temperature, impurities, crystal structure, and mechanical stress. For instance, metals tend to have higher conductivity at lower temperatures, while impurities or defects can decrease conductivity. A material's crystal structure and orientation can also affect its conductivity.
Metal kitchenware is used in cooking because metals are good conductors of heat, which allows for even heating and cooking. Metals also have good durability and can withstand high temperatures, making them suitable for cooking in ovens or on stovetops.
Other materials are covered with rubber to provide insulation and protect against electrical shock. Rubber is an insulator, which means it has high resistance to electrical current and can prevent electricity from flowing through it. This property makes rubber ideal for covering wires, cables, and other electrical components to prevent accidental contact with live wires. Rubber can also provide cushioning, sealing, and protection against heat, moisture, and other environmental factors.