IB Physics: Equivalent Resistance
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- Опубликовано: 15 сен 2024
- Derives and applies the equations for equivalent resistance in parallel. Explains how parallel resistors always give a resistance less than the smallest resistor.
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can one also think of the example at 5:17 such that the equivalent resistance will be less than 10 ohms because since 10 ohms is the smallest resistance, most of the current will take that path but a small amount will take the 20 and 500 ohm paths?
That is right. It is a little different from the previous example since 20 ohms is comparable to 10 ohms, but the reasoning is the same.
Sorry but at 13:15, how did you get 3.91? didnt you do 18/5 = 3.6
1/R=1/18 + 1/5 gives R=3.91
I was just thinking, at around 4:30, shouldn't the equivalent resistance be a little more than 1 ohm? Because the other resistances are greater than 1 ohm, so how could the overall resistance be smaller? I understand the idea of more paths making current flow easier, but how do we know that this outweighs the increased resistance of that path?
There is no increased resistance of the path...just more paths.
Better to listen at 1.5 x speed.
...but then I sound like a chipmunk.
I believe that the last example turns out to have 128.798 so approximately 129 ohms
You are right. thank you.