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2. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   Relay. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.

3. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   v. t. e. In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. [ 1 ][ 2 ] The most common type of switch is an electromechanical device consisting of one or more sets of movable ...

4. H-bridge - Wikipedia

   en.wikipedia.org/wiki/H-bridge

   H-bridge. An H-bridge is an electronic circuit that switches the polarity of a voltage applied to a load. These circuits are often used in robotics and other applications to allow DC motors to run forwards or backwards. [1] The name is derived from its common schematic diagram representation, with four switching elements configured as the ...

5. Electrical contact - Wikipedia

   en.wikipedia.org/wiki/Electrical_contact

   An electromagnetic relay with a pair of contacts. An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. [1] Each contact is a piece of electrically conductive material, typically metal. When a pair of contacts touch, they can pass an electrical current with a certain ...

6. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   Electrical installations. In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location. A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.

7. Reed relay - Wikipedia

   en.wikipedia.org/wiki/Reed_relay

   A reed relay[i] is a type of relay that uses an electromagnet to control one or more reed switches. The contacts are of magnetic material and the electromagnet acts directly on them without requiring an armature to move them. Sealed in a long, narrow glass tube, the contacts are protected from corrosion. The glass envelope may contain multiple ...