Power dividers are also known as power splitters. And when rf power dividers are being used in reverse they are also termed power combiners. They are also known alongside of directional couplers which act as passive devices used in radio technologies. A determined amount of electromagnetic power within a transmission line is routed to a port and a signal is then used within another circuit. Directional couplers merely couple power in one direction. Power that enters an output port will be coupled to an isolated port. But it will not be linked to a coupled port. The directional coupler splits power in equal parts between two ports.
This directional coupler is also known as a hybrid coupler. Directional couplers are built from two coupled transmission lines that are located close together. This allows for the flow of energy from one coupler to the next. It is a preferred technique in microwave frequencies in which case transmission lines are being used to create numerous circuit elements. Lumped component devices can be created at lower frequencies. Both power dividers and directional couplers will have numerous applications. Such applications include the combination of feeds to and from antennas, the formation of antenna beams and the creation of taps for cable distribution systems as is the case with cable TV.
The original power divider was in the shape of a T. But these early creations had poor isolation points between output ports. But for DIY practitioners with a keen interest in creating their own domestic consumption connections, the use of such points would be a useful learning guide. But because you will be dealing directly with the use of electricity, you would have to be extremely careful at how you go about your business.