Why should solid conductors be avoided for flexible connections?

Solid conductors are components that consist of a single piece of metal, typically copper or aluminum, and are designed for applications where the wire will remain stationary. When it comes to flexible connections, solid conductors are not ideal because they lack the ability to bend without breaking. Under conditions where the connection must move or experience frequent flexing, solid conductors are susceptible to fatigue and can fracture after repeated movement. This is due to the stress applied to the conductor, which can lead to micro-cracking and ultimately breakage.

Using stranded conductors, which are made up of multiple smaller wires twisted together, allows for greater flexibility and resilience in these scenarios. Stranded conductors can bend without breaking, making them much more suitable for applications where movement is expected.

The other options, while relevant in certain contexts, do not directly address the fundamental issue related to solid conductors in flexible connections. For example, while solid conductors may sometimes be more expensive or less versatile, these factors do not explain the underlying mechanical disadvantage of using them in environments that require flexibility. Additionally, while solid conductors can typically carry high current, their breakability under stress is the critical concern when considering flexible applications.