Grade 11 and 12 Internal Resistance Calculations Electric circuits

Grade 11 and 12 Electricity (Electric circuits) Internal resistance CALCULATIONS! How to calculate the internal resistance of a circuit.

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[katanamainn]

Hi Miss Martins ❤
for the last question, i used EMF= Vint + Vext because Vext would equal the potential difference across the 5 ohm resistor.
My final equation was therefore [Vext + 1.62 =20] but I get a completely different answer. Just wanted to check why this wouldn’t work?

[koketsomolokoane]

Hi ma'am and thank you for your video, I wanted to ask why you don't use 5 ohm's but resistance in parallel instead, I'm a bit confused

[anjiezott]

Thank you so much 😊. This helped a lot .

[LwethuDube-qy]

Mam why did we use the total current why calculating the parallel potential difference?