19b - 🔴MIDSEM EXAMS: Thevenin's Theorem Problems #knust

19b - MIDSEM EXAMS: Thevenin's Theorem Problems #knust

In this video we are going to learn how to solve circuit problems using Thevenin's theorem.
Thevenin's theorem states that any linear circuit connected between two terminals can be replaced by a Thevenin's voltage Vth in series with a Thevenin's resistance Rth.
To find the current flowing in a resistor;
1. Remove the resistor you want to find the current through and mark the terminal
2. Find the Vth using KVL
3. Deactivate all independent sources, open circuit current sources and short circuit voltage sources and find the Rth
4. Produce the Thevenin's equivalent circuit and reconnect the resistor you removed.
5. Find the current through the resistor using the formula I = Vth/(Rth + Rl)

00:00 - Problem 1
09:43 - Problem 2

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[alvindry]

Really helpfull with my final exam, From Malaysia
thank you

[nyashalant]

Watching from South Africa, your videos are unbelievably helpful, please keep it up man 🫡🫡

[Jambenoire-knlk]

For the first loop it was supose to be instead 42=-8i-6i-2(i+3) bcs when current enter a resistor the is a current drop accross that resistor which makes it negative sir!

[_asianhours]

in second question vth should be equal to vth=4I+20(I+3) ? right? im confused

[AnnieCali]

Thank you so much! This video was very helpful. Thank you for not skipping any steps :)

[juniorarchimedes]

How I was struggling to understand this, , , but you've made it very simple for me
Thank u very much boss

[kalonzo-zutl]

Wow 🎉....
Great job...
This helped me understand how to solve quite a number of problems ❤❤❤

[NJERUELSIEMUTHONI]

I have an inquiry on the second problem, in calculating the thevenin voltage, why wasn't the 4 ohm resistor used ? We only used the 20 ohm resistor yet the 4 ohm resistor is also in the loop in consideration.

[excellencyaddiluv]

i find this piece very helpful, thank you very much.

[nikitassaba]

Why we use the clockwise direction in 4:41 ? It would be a mistake if we have used the anticlockwise?

[megata]

How can the thevenin voltage be greater than the voltage source in problem 2. Is it because of the 3A current source?

[romeladianneretita]

I used Nodal analysis in finding the Vth, and my answer is 10.25V. Is my answer wrong?

[RodneyZharare-oi]

In question 1 Why is the 3A current not being divided between the 2ohm and the 6 ohm resistor

[ChrisB]

But please why is the (6+2)//8. I thought they were all on series?

[AlexMchachi]

why have you ignored th 4ohm resistor when finding VTh

[godswayzottor]

why is it that when finding the thevenin's voltage across the circuit from the right hand side the current will not flow the 4 ohms resistor? please i will be happy with somebody can help me with the understanding.

[lajuelar]

Please explain in details the computation of Rth.

[danielessence]

The 4 ohm resistor wasn't used why??? In calculating the Vth

[fahada]

You missed the voltage across the 5 ohm

[fbkqjum]

man I'm watching different parts to your videos it makes sense but the steps always confuse me its always the beginning as well, where you'd divide the voltage and then at other times you are doing a different step where you just say a number parallel to another number I'm just confused i know its me. its makes sense but if i were to do it without watching's the vid I'm just back to square one i just wish there was a specific formula to keep it the same its always different every time i watch not saying its you.