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The engines of modern jetliners are controlled by Full Authority Digital Engine Controls - FADECs. There are two identical channels per FADEC, one controlling the engine, and one standing by in case of any issues with the first one. FADECs are powered independently of the rest of the airplane, powered by their own Permanent Magnetic Alternator (PMA) mounted on the respective engine (which begin to supply power to the FADECS almost as soon as the starter begins to spin the engines up for start). This allows the engines to continue to run normally and be controlled normally by the Throttles or Thrust Levers (Boeing vs. Airbus terms) regardless of what sort of electrical issues may be happening within the airplane itself.