After melting, potassium bromide will carry electricity. According to Everything Science, a website dedicated to disseminating scientific knowledge, both heat and liquid cause the ions in potassium bromide to escape, allowing for the free movement of particles and causing it to become conductive.
In its solid state, potassium bromide comprises ions, which are atoms with electric charges. However, electricity cannot move between the ions in the solid form of potassium bromide because they are so firmly linked together.
The ions are then free to move and can communicate with one another thanks to the melting. The heated potassium bromide melts and condenses into an ionic liquid. When solid potassium bromide dissolves, for instance in water, ions are released, allowing the material to conduct electricity.