September 27 Homework - check your answers from this video.

This homework is about applying the definitions of current and potential difference to pulses of current in an X-ray tube.  It also gives you practice with handling calculations involving the charge on one electron (e = -1.6 x 10^-19 coulombs) and the large number of electrons that flow in electrical currents.

The equation for the energy transformed E = QVapplies to both the pulse of current and to each individual electron - for one electron the energy transformed is simply:

E = (the charge on one electron) x V, i.e. for one electron,  E = eV.

The worksheet is also on Moodle - here:

http://moodle.qeliz.ac.uk/file.php/127/Chapter_2_Sensing/2_8_Ions_in_X_ray_machines_-_large_and_small_numbers.pdf

 

Watch the video, check your understanding and mark your work.  (I had a problem playing this via Internet Explorer in college - if this happens, try using Chrome instead.  Let me know by email (shunnisett at qeliz dot ac dot uk) if you can't watch the video.

http://youtu.be/Hgpk07VqLLY

Make sure you have written down your calculations clearly - add extra if you haven't.

Hand in your work - make sure you've marked it yourself, clearly - by Thursday 3 October.

Thanks, Steve