'''Ener-D''', spelled as '''Enerdy''' in ''[[Yu-Gi-Oh! 5D's Tag Force 4]]'' and ''[[Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia]]'', known as '''MomentumMoment''' in the Japanese anime version (and sometimes romanized as '''Momentum'''), and short for "duel Duel energy", is a form of energy in ''[[Yu-Gi-Oh! 5D's]]''. It is the ultimate energy generation system that keeps spinning in one direction to create an endless power supply. Enerdy Ener-D is the source of power in [[New Domino City]] that keeps the city running while making the technology for [[Duel Runner]]s, [[Turbo Duel]]s, and Solid Vision(the latest in Kaiba Corb's line of holographic technology) possible.
In the dub, its name comes from the word "energy", but replacing the letters '''GY''' with a '''-D''', which stands for Dueling. The change may have been due to the fact that, in English, momentum and energy have distinct meanings in physics.
==Ener-D System==
[[File:Actual Momentum.jpg|thumb|left|250px|Actual Ener-D system]]
Kaiba Corporation's [[R.R.D.]] was in charge of this technology; the lead developers who had begun the research were [[Yusei Fudo]]'s parents, following [[Dr. Fudo]]'s discovery of the [[Planetary Particle|Planetary Particles]] which were essential to making Ener-D possible.
==Further info on [[Roman Goodwin]] described the Enerdy System==Ener-D as a near-limitless source of energy that doesn't produce any contamination.
The Ener-D Reactor is implied to be a Perpetual Motion Machine, and runs at full capacity in order to meet the power requirements of [[Image:Actual_MomentumNew Domino City]]. Everything in the city is powered by the Ener-D; if the Ener-D shuts down the entire city suffers a blackout. Its limit is in its ability to channel excess energy it produces.jpg|thumb|left|240px|Actual Enerdy SystemThe appearance of the [[Crimson Dragon]]during the Duels between Yusei Fudo and [[Jack Atlas]] caused the system to exceed its limits.
It is known that Kaiba Corporation's [[MDuring their first match when the Crimson Dragon appeared, it overpowered the system by dramatically overflowing the energy generation to it.I.D.S]] is in charge As it was incapable of this technology; handling so much power, the lead developers who had begun system completely shut down, leaving the city in a total blackout. The overflow problem occurred once again during the research into it were [[Yusei FudoFortune Cup]]'s parents.In the English anime, its name comes from energy, but replacing the '''G''' with a '''D''', which stands for duelingthough according to [[Zigzix]] it was running at full operation. The change may Apparently some modifications had to have been due made to the fact that in Englishsystem, since the second appearance of the term momentum refers Crimson Dragon only caused the temperature and pressure within the Ener-D Reactor to reach critical point rather than cause the product of a body's mass times its velocity. Momentum is mathematically related system to kinetic energy even though blackout as it is a different phenomenahad before.
The Enerdy system is implied According to be a Perpetual Motion Machine, and runs at full capacity in order to meet the power requirements of [[New Domino CityBruno]]. Its limit , the Ener-D is in its ability to channel excess energy it produces. The appearance of the [[Crimson Dragon]] during the duels between [[Yusei Fudo]] self-aware and [[Jack Atlas]] caused can read the system to exceed its limits. During their first match when the Crimson Dragon appeared, it overpowered the system by dramatically overflowing the energy generation to it. As it was incapable emotions of handling so much powerhumans, the system completely shut down, leaving the city in and should a total blackout. The overflow problem occurred once again during human reach the [[Fortune CupClear Mind]]state, though according to [[Zigzix]] it was running at full operation. Apparently some modifications had to have been made to the system, since the 2nd appearance of the Crimson Dragon only caused the temperature and pressure within the Enerdy system to reach critical point rather then cause the system to blackout as it had beforethey can control that Ener-D.
==Old Momentum==It is later revealed that Synchro Summoning causes the Ener-D to spin faster, speeding up the evolution of humanity in the process. However, if it spins too quickly, it will shift into reverse, creating an explosion like [[Zero Reverse]] at a massive scale.
In the apocalyptic future that [[Image:Old_Mometum.jpgZ-one]], [[Bruno|thumb|right|250px|Old MomentumAntinomy]], [[Aporia]], and [[Paradox]] came from, humanity had abused the power of Ener-D to control evolution and filled it with greedy desires and emotions to the point that the Ener-D went insane and created an army of [[Meklord Emperor]]s to kill all of humanity, and later exploded completely; these two events completely destroyed the world and humanity itself. The only survivors attempted to stop this apocalyptic future by going the past and erasing Ener-D from existence.
After the Fortune Cup, the existence of a first Enerdy system was revealed within In [[Satellite]]Yu-Gi-Oh! 5D's inner grounds. However, according to [[Rex Goodwin- Episode 149|episode 149]], as it was is revealed that the first system, it was totally insecure and imperfect when it was activated seventeen years before by [[M.I.D.SMeklord Emperor Genocide]]. Consequently, could be stopped by removing the system's activation resulted in negative emotions that caused the major catastrophic event known as the "[[Zero Reverse]] Effect". This was the reason behind the destruction and splitting Ener-D to go out of [[Domino City]] into New Domino City control and Satellite. The system was abandoned on Satellite, until it was "found" by build the Meklord Emperors in the [[Dark Signers]]. According to Goodwinfirst place, but unfortunately Z-one discovered this too late and couldn't stop the old system is being used as a door to the UnderworldEner-D before it exploded.
ItThanks to Z-one's also known that this system possesses four controllers (safety switches) located in intervention, the [[B.A.D.]] area. These controllers are a fail-safe switch in case something happened -they weren't present day New Domino City became aware of much help in preventing a catastrophe when the zero reverse accident occurredsituation, though that was because those running the system wanted an accident to occur. Each of the controllers is code-named with the name of one of the Immortal Gods and is guarded by the Dark Signer who possess the corresponding Yusei created a program known as [[Earthbound ImmortalFortune]] Duel monster card. The main system itself is represented by , which keeps the Spider mark and is guarded by Ener-D under control, thus preventing the Dark Signer boss RudgerMeklord Emperor Genocide from occurring.
==Ener-D Reactor==
[[File:Old Mometum.jpg|thumb|right|250px|Ener-D reactor]]
After the Fortune Cup, the existence of the Original Ener-D Reactor was revealed within [[Satellite]]'s inner grounds. However, according to [[Rex Goodwin]], as it was the first system, it was totally insecure and imperfect when it was activated seventeen years before by [[R.R.D.]]. Consequently, the system's activation resulted in the major catastrophic event known as the "[[Zero Reverse]] Effect". This was the reason behind the destruction and splitting of [[Domino City]] into New Domino City and Satellite. The system was abandoned in Satellite, until it was "found" by the [[Dark Signers]]. According to Goodwin, the Original Ener-D Reactor was being used as a door to the Underworld.
[[File:Old Enerdy Tower.jpg|thumb|left|Ener-D reactor tower]]
The system possessed four safety switches located in the [[B.A.D.]] area. These were a fail-safe placed long ago after the system was shut down completely. Each of the control units are code-named with the name of one of the [[Earthbound Immortals]] and is guarded by the Dark Signer who possess the corresponding Earthbound Immortal card. The main system itself is represented by the Spider mark and is guarded by the leader of the Dark Signers, [[Roman Goodwin]].
{{Yu-Gi-Oh! 5DBefore Roman and Yusei's}}second Duel took place, the Dark Signers blew up the Original Ener-D Reactor. As the negative energy was released the two of them, standing above it, commenced their rematch. Yusei won the Duel but Roman blew up the bridge and Yusei fell into the reactor.
Only three of the four control units were activated, as [[Akiza Izinski]]'s Duel with [[Misty Tredwell]] prevented her from activating the last tower in time. ==Trivia==* In the dub, Rex simplified how Ener-D worked as "powering a city with a pack of cards"; since Dueling was done by everyone by the point of discovery. {{Yu-Gi-Oh! 5D's}} [[Category:Technology]][[Category:Yu-Gi-Oh! 5D'sitems]]
