What are the four main physical characteristics of a conductor?

The four main physical characteristics of a conductor are indeed strength, weight, diameter, and resistance. Each of these attributes plays a significant role in determining how effectively a conductor can function in electrical applications.

Strength refers to the material's ability to withstand mechanical stress without breaking, which is crucial for conductors that may be subjected to physical forces or environmental factors. Weight can be important for applications where the conductor needs to be supported or where lighter materials are preferred for ease of installation. Diameter is a key factor because it directly affects the conductor's electrical resistance and current-carrying capacity; a larger diameter usually allows for more current to flow. Finally, resistance is an essential characteristic of conductors, as it determines how much energy is lost as heat when current passes through the material.

These characteristics collectively influence the performance, efficiency, and suitability of conductors in various electrical systems. The other options do not encompass the relevant attributes needed to describe conductors comprehensively, focusing instead on less critical traits or mixing characteristics that are not defined for electrical conductors.