When soldering electrical connections, which type of wire must be used with rosin core solder?

When soldering electrical connections, solid wire is ideal for use with rosin core solder because the rigid nature of solid wire makes it easier to create a secure and lasting bond when heat is applied. The rosin core solder, which contains a flux made of rosin, helps to clean the surface of the wire and improve conductivity during the soldering process. Since solid wire does not have the flexibility that stranded wire offers, it allows for better contact and alignment during soldering, leading to more effective heat transfer and a stronger joint.

While stranded wire can also be soldered successfully, it typically requires a different approach and may involve using a different type of solder or methods to ensure that all strands are properly heated and bonded. This can complicate the process compared to the straightforward technique suitable for solid wire soldering with rosin core solder.