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2. Electrofishing - Wikipedia

   en.wikipedia.org/wiki/Electrofishing

   Electrofishing is a common scientific survey method used to sample fish populations to determine abundance, density and species composition. When performed correctly, electrofishing results in no permanent harm to the fish, which return to their natural mobility state in as little as two minutes after being caught. [1]

3. AC adapter - Wikipedia

   en.wikipedia.org/wiki/AC_adapter

   AC adapter. A "wall-wart" type AC adapter for a household game console. The output has a barrel connector. "Power brick" in-line configuration, with detachable AC cord and NEMA 1-15 plug. An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) [1] is a type of external power supply, often enclosed ...

4. Knife switch - Wikipedia

   en.wikipedia.org/wiki/Knife_switch

   Dual-pole, dual-throw knife switch in one of its two closed positions. A knife switch is a type of switch used to control the flow of electricity in a circuit. It is composed of a hinge which allows a metal lever, or knife, to be lifted from or inserted into a slot or jaw. The hinge and jaw are both fixed to an insulated base, and the knife has ...

5. Alternating current - Wikipedia

   en.wikipedia.org/wiki/Alternating_current

   Alternating current ( AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy ...

6. Ripple (electrical) - Wikipedia

   en.wikipedia.org/wiki/Ripple_(electrical)

   Ripple (electrical) Ripple (specifically ripple voltage) in electronics is the residual periodic variation of the DC voltage within a power supply which has been derived from an alternating current (AC) source. This ripple is due to incomplete suppression of the alternating waveform after rectification. Ripple voltage originates as the output ...

7. Night of the Long Knives - Wikipedia

   en.wikipedia.org/wiki/Night_of_the_Long_Knives

   The Night of the Long Knives ( German: Nacht der langen Messer ⓘ ), also called the Röhm purge or Operation Hummingbird (German: Unternehmen Kolibri ), was a purge that took place in Nazi Germany from 30 June to 2 July 1934. Chancellor Adolf Hitler, urged on by Hermann Göring and Heinrich Himmler, ordered a series of political extrajudicial ...