AS Physics Practical links

Look at http://www.practicalphysics.org/

Measurement of g using an electronic timer

http://www.practicalphysics.org/go/Experiment_426.html

Internal resistance of a battery
http://www.practicalphysics.org/go/Experiment_649.html?topic_id=8&collection_id=92
http://www.iop.org/activity/education/Projects/Teaching%20Advanced%20Physics/Electricity/EMF%20and%20Internal%20Resistance/page_3610.html

Diffraction
http://www.practicalphysics.org/go/Experiment_124.html?topic_id=1&collection_id=20
http://www.s-cool.co.uk/alevel/physics/diffraction/diffraction-reviseit.html
http://www.antonine-education.co.uk/Physics_A2/Module_4/Topic_6/topic_6__wave_behaviour.htm