Which component allows electrical connections to pass through rotating assemblies?

• A. Hub adapter
• B. Foam
• C. Slip ring
• D. Shrink disk

Answer: (C)

A device that maintains an electrical connection while parts rotate is needed to pass electricity through a rotating assembly. A slip ring is designed for this purpose: it has conductive rings mounted on one part and brushes pressed against those rings on the other part, so current or signals can flow from a stationary source to a rotating load without wires getting tangled. The brushes stay in contact as the assembly turns, enabling continuous transfer of power or data. This is why slip rings are used in rotary joints, wind turbines, robotics, and similar applications. The other items aren’t built to transfer electricity through rotation—hub adapters are for mounting, foam is insulation or cushioning, and shrink disks are fasteners.