If the goal of the turbine is to put out electric energy, what is the efflciency of the turbine?

If the electrical energy put out by the turbine is the useful part
of the output, then the efficiency of the turbine is ...

     (the amount of electrical energy that's put out in some period of time)
divided by
     (the amount of energy put in during the same period of time,
      in the form of steam, falling water, kinetic energy of wind, etc.)  

Your answer is c. explanation: plasma  is the fourth state of matter, derived from the gaseous state of matter.  plasma  can contain free  electrons  and/or  ions. while  plasma is never neutral, it can either be positively or negatively charged.  gases, however, are electrically neutral.