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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   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. In contrast to a simple light switch ...

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. Two-way communication - Wikipedia

   en.wikipedia.org/wiki/Two-way_communication

   Two-way communication involves feedback from the receiver to the sender. This allows the sender to know the message was received accurately by the receiver. One person is the sender, which means they send a message to another person via face to face, email, telephone, etc. The other person is the receiver, which means they are the one getting ...

5. Railroad switch - Wikipedia

   en.wikipedia.org/wiki/Railroad_switch

   A three-way switch is used to split a railroad track into three divergent paths rather than the more usual two. There are two types of three-way switches. In a symmetrical three-way switch, the left and right branches diverge at the same place. In an asymmetrical three-way switch, the branches diverge in a staggered way using two interlaced ...

6. 3-way lamp - Wikipedia

   en.wikipedia.org/wiki/3-way_lamp

   A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...

7. RF switch - Wikipedia

   en.wikipedia.org/wiki/RF_switch

   An RF switch or microwave switch is a device to route high frequency signals through transmission paths. RF ( radio frequency) and microwave switches are used extensively in microwave test systems for signal routing between instruments and devices under test (DUT). Incorporating a switch into a switch matrix system enables you to route signals ...