A-level Physics Core Practical: EMF and internal resistance

For teacher's notes, other resources and more films from this series, see: nustem.uk/acti...
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.

[@siphumelelebuthelezi8185]

how do i connect connect rheostat , power source and multimeters to measure current and voltage?

[@egfaomar7303]

What is the safety note for this experiment?

[@ntombekhayalande6165]

Why does the circuit have a closed switch

[@Tarlochanmahajan]

current is in mA .. i think resistance of cell comes out less than .1 ohm

[@DK-sg3oe]

But y is the voltage going down as u decrease the resistance?

[@fateshow5303]

life saver thank u

[@Morninghaya]

Mr Shaha on that

[@naweyeeminn23]

For taking pictures for the readings for both A and V momentarily ,i doubt that its accurate. values could change depend on the person's reaction time. That wobbling the readings had me headache and never get the consistence readings..

[@joelcairns8375]

the point to get to values at the same time, which depends on the shutter speed, it doesnt matter how quickly you take them

[@gowthamanand7419]

Sir, What is the value of external resistance??

[@gainingvisionsa]

It varies. by using the rheostat you can change it s that current changes.there should be a value for the maximum resistance on the rheostat and also its minimum value.

[@njoyausman5264]

The problem I have is that you people don't show us in details how your connections are done!!!!