From TheBestLinks.com
Pulsed plasma thrusters use an arc of electric current through a
solid propellant (almost always teflon), to produce a quick and dependable burst of impulse. PPT's are great for attitude control, and for main propulsion on particularly small spacecraft (those in the hundred-kilogram or less category). However they are also one of the least efficient electric propulsion systems, with a thrust efficiency of less than 10%.
See also: Hall effect thruster, Magnetoplasmadynamic thruster, Spacecraft propulsion
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