Now, can you answer the following questions?

      Some energy questions:

   1. How much energy does a single chunk of water, 
           of mass 1 kg, gain as it drops over the falls?

   2. If only half of that energy is captured by the generator, 
           how many kilograms of water must flow flow 
           through each generator's turbie each second?

   3. How does this compare to the mass of all 
           the water actually spilling over the falls each second?
   4. There are about twenty generators combined in the US and 
           Canadian hydropower plants. What is the total mass of 
           water flowing through the turbines?

   5. How fast is the water going as it runs through the turbine?




      Some electricity questions:


   6. What is the frequency of the voltage created by one generator?

   7. How many turns, N, of wire must there be inside a single generator?

   8. How large is the current running through the coils of wire?

   9. How long is the wire?

  10. All that current running through the wire could heat up 
            the wire quite a bit -- wasting lots of the energy generated. 
            If the wire is made of pure copper, and circular in 
            cross section, what is the minimum possible diameter it can have?

  11. What is the mass of all that copper?

  12. Is it really possible to pack the required number of turns of wire, 
            of the required diameter, into the space inside 
            one of these generators?