AC-DC adapters accept AC input voltage directly from a wall outlet, and output DC voltage

DC to AC inverters are used for converting direct current (DC) into alternating current (AC). They are also known as DC to AC converters

AC power connectors transfer alternating current through a variety of electronic devices. AC power connectors include simple AC inlets, outlets, and power entry modules

Power rectifiers are electrical devices that convert alternating current (AC) to direct current (DC). They are an integral part of telecom rectifiers for the telecommunications industry, and in battery chargers, DC power systems, and other power system devices

Power supplies are devices that produce AC or DC power.  This grouping includes current sources, DC power supplies, AC-DC adapters, DC-DC converters, AC power sources, and DC-AC inverters

AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.  

DC-DC converters accept DC input and provide regulated and/or isolated DC output in various applications including computer flash memory, telecommunications equipment, and process control systems

AC to DC converter chips transfer an AC input into DC power using switching (MOSFET, IGBT) or rectification (diodes, Schottky diodes

DC to AC converter chips transfer a DC input into AC power by using switching, inversion, or other technology

DC power supplies accept an input power and output the desired form of DC power. Common types of DC power supplies include linear power supplies, switching power supplies, DC-DC converters, and silicon controlled rectifier (SCR) type power supplies

Power or line conditioners regulate, filter, and suppress noise in AC power for sensitive computer and other solid state equipment

Power over Ethernet (PoE) products use network cables to deliver DC power and data to network devices. PoE products use RJ connectors instead of AC-DC adapters and eliminate the need for separate power cables

Power distribution units (PDUs) have an electrical input and several outputs, often as electrical outlets, for powering multiple devices. 

Circular connectors are multi-pin connectors primarily used for external interfacing.

Vacuum pumps and vacuum generators provide sub-atmospheric pressure for a variety of industrial and scientific applications where a vacuum is required.