For teacher's notes, other resources and more films from this series, see: http://thinkphysics.org/activity/a-level-physics-required-practicals/
Alom Shaha and Christina Astin present the required practical for A-level Physics: finding the internal resistance and EMF of a cell.
Written & presented by Alom Shaha.
Directed & Edited by Jonathan Sanderson
Advisors: Christina Ashine, Carol Davenport, David Sang.
Produced by Physics Partners and NUSTEM, with assistance from the Ogden Trust.