https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-many-toy-batteries-would-it-take-to-start-a-car/x4352f0cb3cc997f5:cells-in-series-and-parallel-why-can-we-not-use-aa-cells-as-car-batteries/e/cells-emf-and-internal-resistance 2026-04-15T00:13:52.314079129Z Cells: emf and internal resistance Let's practice some problems to better understand how the internal resistance of a cell influences the terminal voltage and the current that can be drawn from it. Satrajit exercise https://tr.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-many-toy-batteries-would-it-take-to-start-a-car/x4352f0cb3cc997f5:cells-in-series-and-parallel-why-can-we-not-use-aa-cells-as-car-batteries/e/cells-in-series-and-parallel 2026-04-15T00:13:52.314079129Z Cells in series and parallel Let's practice some problems to get better at solving circuits with multiple cells in series or parallel combinations. Satrajit exercise