From the Super Mario Wiki, the Mario encyclopedia
Electric Pressures are devices that appear in Super Mario Galaxy 2. They are the yellow versions of the Water Shooter and Fire Pressure, with, like the others, a nozzle similar to F.L.U.D.D.'s. They appear in Space Storm Galaxy, in the mission Follow Me, Bob-omb, in the Electric Field Area where the player uses the Pull Stars. They shoot homing orbs of electricity at Mario or Luigi. If it hits, it will cause him to fall and lose a wedge of health, and possibly fall into the black hole (the player can still quickly grab a Pull Star to stop Mario or Luigi from falling). The electric orbs are the same ones that the Undergrunt Gunner in Toy Time Galaxy and the Boomsday Machine in Bowser Jr.'s Boom Bunker shoot out. Prior to shooting, Electric Pressure tend to charge up and glow, thus making it easy to predict their firing pattern.
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