Slope, s =ΔI^-1/ΔV^-1
-I ensured tight connections of connecting wires.
-I ensured that the key was opened,to avoid the running down of the battery.
Internal resistance (r): This is the opposition of the current flow through the electrolytic cells.
Heating effect is used in electric cooker for cooking.
~ is donated with ohms
r=1~ , R=6~ , V=9v , E=?
9/6=E/6 + 1
Making E subject of formula
So therefore,E.M.F of the cell=10.5v