Calculating the total resistance in an electrical circuit, lol. I studied it, but it never came up on the test.wtf is this?! lol
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Calculating the total resistance in an electrical circuit, lol. I studied it, but it never came up on the test.wtf is this?! lol
lol disgustingCalculating the total resistance in an electrical circuit, lol. I studied it, but it never came up on the test.
For me, this section was almost completely conceptual. I don't think I even used any scratch paper or had to do any calculations (although I do recall having to calculate something with a spring, but I didn't study that so I just guessed). The questions were more along the lines of:
- if this gear turns this way, which way will this other gear turn?
- if this gear turns x amount of times, will this smaller gear turn more, less, or the same amount of times?
- which way does the fulcrum need to move to have x affect on some object on the lever?
- how much force do I need to put on this pulley to lift the object? (super simple numbers, but know mechanical advantage)
- if an x-gallon bucket can be filled at y gallons/minute and drained at z gallons/minute, how long to fill the bucket if it's being filled and drained at the same time?
- if this cam rotates x times, how many times will the valve open?
- if this object is thrown with a horizontal velocity and this other object is dropped with no velocity, which will hit the ground first?
- at what position will the piston be exerting the most force?
Any other questions, don't hesitate to ask. I took the test on 15 DEC.
I can't guarantee you won't see the one-off questions. Maybe I just got lucky? Who knows. My OAR was a 56, which is above average, but nothing jaw-dropping. I assume the tough questions come out if you're doing well.Most of that seems pretty easy to me. I saw a bunch of other questions from other pages of this thread that threw me off. Some very obscure one-off questions about temperature/nuclear reactors/etc. The last two you mention about velocity and piston exerting force, where would I find an example of these questions? Didn't know them so trying to make sure I do.
For parallel resistors, all you really need to know is that first equation: 1/Req = 1/R1 + 1/R2 + 1/R3 and so on depending on how many resistors there are in total. Once you get the 0.0035 using the equation, set it equal to 1/Req and solve for Req.
Can someone help me understand how to get the MA of the gears in this picture?
it is just 1:1, correct me if I am wrong but each of the gears has 7 points so they all are turning similiar
Can someone help me understand how to get the MA of the gears in this picture?
Concur with 1:1
How do you get that though? I think I'm confusing myself. I see that all the gears have the same teeth, but if they all had different # of teeth, how would you break it down?
If you google "advantage of ac over dc" the first link provides a nice summary.DC: current flows continuously in the same direction
AC: the current changes direction periodically
What is the advantage of AC?