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2. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   A relay Electromechanical relay principle Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts An automotive-style miniature relay with the dust cover taken off. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple ...

3. Automobile auxiliary power outlet - Wikipedia

   en.wikipedia.org/wiki/Automobile_auxiliary_power...

   For the 12 volt systems, the center contact is the positive terminal and the shell is the negative terminal. Most automobiles connect the negative terminal to the frame of the vehicle (negative ground). 12 volt auto connectors are made to comply with a standard by Underwriters Laboratories for safety. UL2089 was developed to cover the ...

4. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   1R5/DK91 – Pentagrid converter, anode voltage in the 45...90 volt range. 1S4 – Power output pentode Class-A amplifier, anode voltage in the 45...90 volt range. 1S5 – Sharp-cutoff pentode Class-A amplifier, and diode, used as detector and first A.F. stage in battery radio receivers. Anode voltage in the 67...90 volt range.

5. Tube socket - Wikipedia

   en.wikipedia.org/wiki/Tube_socket

   Loctal tube type numbers in the USA typically begin with "7" (for 6.3-volt types) or "14" for 12.6-volt types. This was fudged by specifying the heater voltage as nominally 7 or 14 volts so that the tube nomenclature fitted. [17] Battery types (mostly 1.4-volt) are coded "1Lxn", where x is a letter and "n" a

6. Utilization categories - Wikipedia

   en.wikipedia.org/wiki/Utilization_categories

   Control of small electromagnetic loads with holding current ≤ 0.2 A; e.g. contactor relays 60947-5-2 A: Protection of circuits, with no rated short-time withstand current: 60947-3 B: Protection of circuits, with a rated short-time withstand current: 60947-3 DC-1: Non Inductive or slightly inductive loads, resistance furnaces, heaters: 60947-4 ...

7. Solid-state relay - Wikipedia

   en.wikipedia.org/wiki/Solid-state_relay

   A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay , but solid-state electronics contain no moving parts and have a longer operational lifetime.