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2. Trouble light - Wikipedia

   en.wikipedia.org/wiki/Trouble_light

   Trouble lights are usually powered by AC wall current, but some are powered by a 12-volt source, such as a car battery. The bulb of the trouble light typically has a heavy filament to withstand dropping, and therefore is also referred to as a drop light. [1] Newer models often use LED arrays as the light source. LEDs are more energy efficient ...

3. Series and parallel circuits - Wikipedia

   en.wikipedia.org/wiki/Series_and_parallel_circuits

   Series circuits were formerly used for lighting in electric multiple units trains. For example, if the supply voltage was 600 volts there might be eight 70-volt bulbs in series (total 560 volts) plus a resistor to drop the remaining 40 volts. Series circuits for train lighting were superseded, first by motor-generators, then by solid state devices.

4. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   The switches may be arranged so that they are in the same orientation for off, and contrasting orientations for on. [1] A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This ...

5. Emergency light - Wikipedia

   en.wikipedia.org/wiki/Emergency_light

   An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories , apartments , and hotels .

6. Anderson Powerpole - Wikipedia

   en.wikipedia.org/wiki/Anderson_Powerpole

   This is an accepted version of this page This is the latest accepted revision, reviewed on 4 October 2024. Family of electrical connectors Anderson Powerpole Anderson Powerpole 15/30/45 ampere housings and contacts (front view) Type Electrical connector The Anderson Powerpole is a family of electrical connectors by Anderson Power Products (APP), although plug compatible connectors are now ...

7. Automotive battery - Wikipedia

   en.wikipedia.org/wiki/Automotive_battery

   While the engine is running most of the power is provided by the alternator, which includes a voltage regulator to keep the output between 13.5 and 14.5 V. [4] Modern SLI batteries are lead-acid type, using six series-connected cells to provide a nominal 12-volt system (in most passenger vehicles and light trucks), or twelve cells for a 24-volt ...