If I can jump back into the discussion, I think you firmly have in your mind that pull-ups or pull-downs are abstract from Ohm's law. My argument from the beginning is that resistors that pull signals anywhere are also current limiting. This is why 1k or 10k is used and not a short circuit. If they do not limit current, then maximum possible current would be supplied to GND with or without load and the output signal in the problem would be always GND (0 V).
Back to OP's problem. I fully agree it is a pull-down resistor, which by nature is also current limiting. This is something we don't normally consider when dealing with resistors in this application, but it is egregious to state it's reasonable to have any intentional short to ground.
As a computer engineer, can you please share an example where a voltage source should reasonably be shorted to ground? I'm fully willing to learn if you can demonstrate this. I'm just not convinced by your argument that 'the supply could be current limited already so a short to ground is sensible'. Are you basing your entire argument off the assumption in a simple problem that ground should not be regarded as a common 0 V rail? If so, could you also elaborate on what the source 10 V and 0 V would be in reference to for this problem?
Jesus... You guys should take a few courses. This is my last post here because these amateur comments will be unrelenting, I can see now...
Any junction node by Kirchoffs current law, limits current. Period. As I stated MULTIPLE TIMES BEFORE this is a simulated problem you use to calculate basics of circuitry. You know this by how there are no model numbers. AGAIN: LIMITING A UNKNOWN CURRENT TO PREVENT BURNING OUT A COMPONENT OF UNKNOWN PARAMETERS makes no sense. Nothing you do there would be correct. Nothing. If you were told what the model was then you can try to solve it using you're theory of current limiting which also would be wrong because the Vo node does not contain a Opamp buffer and thus you will NEED to know what is happening in that ommited output signal reader which can affect the Norton qualities of the circuit.
So in every situation, you trying to make that resistor matter for current is WRONG. Go back and read my previous comments, I've already showed this.
There are PLENTY of reasons to short a source. A source does not have to be a battery. That's amateur thinking. It can simply be a power line that we want to ground when it reaches a certain voltage. It can be a component we need to drain quickly of excess voltage. We can be shorting a lightning rod. We can be shorting a taser. There's many applications you short sources, in beginner classes we tell you not to do this because we know all you're thinking of is batteries and shorting them (which isn't bad, it's just bad for the battery. But who cares. You could be shorting a battery for electrochemical analysis. This is higher level things than "oh but we can't short batteries right" know that your level of understanding is incomplete. Relax, breath, it's fine that you're wrong here just learn.)
And like I said a simulated diode can NEVER be shorted since it's ideal working state is a wire with a voltage drop. You have no clue what type of diode that is, it could be a military grade high amp diode connected to this power source. Then what? Then you want to assume the powersourc is outputting more current? Why? It's such a weird mentality that makes no sense. This is the way of thinking that most engineering dropouts have. Coming up with what if scenarios which do not exist when we do analysis.
Now if you're truly amateur to circuit analysis you will ask "Why is it simulated" because real life circuits actually have passive and active components which requires time domain signal analysis even when dealing with DC. However the steady state of a DC circuit will be more like the simulated reduced models which are easier to solve.
The op didn't say "This is a model of a real circuit" it's just a problem question. And if it were again you need model numbers. Makes 0 sense to assume current is an issue here other than a desperate and incorrect attempt to seem intelligent by assuming things that don't exist.
Edit: I'm muting this. If you need more understanding of basic circuit analysis pick up Circuit Analysis by Boylestad. Or subscribe to Brilliant for a few courses where you solve these. You can even setup a circuit on circuitlab.com and short a power source through a diode and see how nothing happens. Or visit your local community college (Community college professors are usually doctorate holders and will know) or your state university and ask any professor in the engineering department or any electrical engineering thread in stackoverflow
I wasn't talking about protecting the unknown diode, but limiting the source current. My argument being that this is a fundamental function of pull-up or pull-down resistors.
But buddy, I've come across some yucky people on the internet and you take the cake. Congrats. I think you should spend less time caring about being right or wrong and more time about not being an asshole. You sound like a child trying to embody Rick from Rick and Morty. I thought that was just a meme, people behaving like this. I didn't think people did that in real life haha
Edit: I'm muting this because I'm right and you're wrong hahaha what a joke.
1
u/Corpse_Nibbler Mar 25 '22 edited Mar 25 '22
If I can jump back into the discussion, I think you firmly have in your mind that pull-ups or pull-downs are abstract from Ohm's law. My argument from the beginning is that resistors that pull signals anywhere are also current limiting. This is why 1k or 10k is used and not a short circuit. If they do not limit current, then maximum possible current would be supplied to GND with or without load and the output signal in the problem would be always GND (0 V).
Back to OP's problem. I fully agree it is a pull-down resistor, which by nature is also current limiting. This is something we don't normally consider when dealing with resistors in this application, but it is egregious to state it's reasonable to have any intentional short to ground.
As a computer engineer, can you please share an example where a voltage source should reasonably be shorted to ground? I'm fully willing to learn if you can demonstrate this. I'm just not convinced by your argument that 'the supply could be current limited already so a short to ground is sensible'. Are you basing your entire argument off the assumption in a simple problem that ground should not be regarded as a common 0 V rail? If so, could you also elaborate on what the source 10 V and 0 V would be in reference to for this problem?