Physics | Electric Circuits | Voltage vs Current graphs

In this lesson you will learn:
- How to interpret graphs based on Ohm's Law.
- How to calculate the internal resistance when given a voltage vs current graph
- how to determine the EMF on a voltage vs current graph

This lesson is relevant for IEB and NSC candidates in grade but it can find application also in IGSCE exams.

Enjoy!

[GladysMakonxa]

Prelims are starting by this week friday . Goodluck matriculants of 2024❤

[nontsikelelomxoli]

Thankyou Sir for your help, much appreciated.keep up the great work you doing

[KgothatsoNkaunyana]

Your lesson are the best can't lie but if you take too long to explain and all that we sometimes don't finish watching the videod because they take too long but otherwise you're the best

[vutlhariinyalungu]

Why does the gradient represent the internal resistance and not the total resistance?

[seanlumadi]

Sir why is the internal resistance negative

[bryangomez]

sir can i ask if V loss is equal to V internal?

[xolile_andile]

Also please do Questions for preliminary exam sir💔you last did the multiple choice

[roshaanghani]

sir how can you tell which axis is which

[preciousngwenya]

Sir how do we calculate r and emf if the graph given is resistance vs 1/current? I was practicing using 2018 nov question paper! Calculating the internal resistance i used the gradient but my answer was wrong. Then for the emf I took the value where 1/current was zero, but then i was wrong.

[Okuhle_Mnisi]

I'm writing today paper 1 I'm nervous

[sihaskumarasingha]

why does the graph have negative gradient? sorry i realise it sounds like a stupid question lol

[bonginkosisibisi]

Thank GOD for giving us you, you are making my life easier as an Educator.

[koenatebatso]

1.If you see a variable resistor does it always mean we are investigating the internal resistor?
2.Is there an exception where the gradient of the graph is not the internal resistance?

[solvingexampapers]

Great content! All the best to 2021 learners, making use of this platform will help them a lot.

[koenatebatso]

Is the voltage on y-axis always the external voltage or you can be given the internal voltage?

[seanlumadi]

Sir why is the internal resistance zero

[lula]

Shouldnt you use values at the same point. Since voltage is 0; 7.2 shouldnt current be 0;0. Though im aware that wont work as your denominater but still right?

[oneyy]

Sir wnen the graph has the inverse of voltage and resistance what is the gradient? and how can I relate the equation the students formed for the expiriment to the graph?

[mnash_mcm]

Sir keep up with the good..., do not stop ...♡

[dreamclub]

Tnque sir. I was never a fan of circuits for the past two years until i came across your videos