Our last labs have been to study frequency response first in the simple RC and RL circuits where just the break frequencies
For the last three weeks in lab we have been building and working on RC, RL and now finally RLC circuits.
I am happy to say I needed no help in the RC circuit. We used the components suggested on the board a resistor equal to 4.7k Ohms & a capacitor equal to 0.10 µF . Plugged it into the Oscope and used a function generator to set the vpp to 0.05V & bam a wonderful Vout wave! YIPPEE! then we varied the frequencies and got waves of varying amplitudes. Then for grins and giggles we doubled the resistor amount to 10K, ran the same frequencies and noticed something I think we were suppose to notice…… the amplitudes of the wave decreased by half.
Hey is this what they mean by "Low" pass filter – where now less higher frequencies are making it through? Not certain, but I like it cause it sounds good. Is this was young guys feel like when they get their first girlfriend? Now what do I do and what does this all mean and how do I use this?
Then the lab kicked our butt with the RL because we kept trying to get a signal with the RL circuit, but it was flatline. nothing no matter what crazy frequency we put in. We were stuck! Then my lab professor said the magic word "transfer function gives you the break frequency" So I web searched all weekend and found this cool math formula which happened to wind up being my time constant = (R/L). So I solved it for R and found that my Resistance was off the chart too high!@!!! I then went into the lab over the weekend with my 12 year old daughter (it was fun – you should see what her experiment was – it made noise)…. Used a 2.2 Ohm resistor with a 171.1 µH inductor & BAM BAM I got an out signal! Not an easy task! Kiss – I love myself.
So in the same meaningless way I created a "High" pass filter – where now only high frequencies made it through. Again doubling the resistance just lowered the bar allowing more frequencies to pass through. Interesting how this reversed with the inductor and capacitor – as ahoy says, the capacitor stores charge and the inductor stores current and it is this property that gives these elements the ability to perform their jobs, but because Voltage & Current are inversesly proportional to each other V=IR is just R= V/I – lower the current and it increases the voltage (because 10/2=5V, but 10/1=10V – doubled the voltage).
Now I have RLC – we spent all lab figuring it out – well the boys did – I kept saying pick a resistor between 2.2 Ohms and 4.7k Ohms. Then you will be successful. I think after 3 hours they said what have we got to loose – so we started with 5 Ohms and got an out signal. It was great.
Now it is time to present in front of the class. Hell I have no Idea what this all means other than the online garbage of filtering & RLC can do band pass filtering setting the desired frequencies in the middle with the inductor filtering out the low frequencies & the capacitor filtering out the high frequencies to get the desired middle.
I sure wish I could blow them away with Ahoy’s comments, but this is about motors, not filtering and isnt that interesting how the same can be used in both for something amazing.
[quote] In an AC power system, motors transformers etc. that appear inductive will reflect stored energy back to its source in the form of current built while the instantaneous voltage was high. Unfortunately, there is resistance in the source. This resistance will dissipate energy in the process of delivering the actual energy used but will also burn the energy reflected back by the inductance. Many motors compensate this somewhat by paralleling capacitors with the inductive load. The energy stored by the inductive load is reflected into the capacitor and then the capacitor delivers the energy back when the voltage from the source begins to reverse. When well tuned, the motor and capacitor will look like a resistor and no energy will be wasted in the generating and delivery system. [/quote]
I am happy just trying to find a way to explain it to my 12 year old so I see the light in her eyes go on in understanding. Any ideas to make this topic simple enough for a non-technical person to understand?
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I’m asking this one on behalf of someone else, but the book sounds fascinating. Any help would be appreciated!!
Many years ago (mid to late 80′s) I read a time travel romance and loved it. I think there were 2 novels. Unfortunately, I can’t recall the author or the title of either novel. I think the author’s first name is either Lisa or Jill but I’m not sure and I have no recollection on her last name. None what-so-ever. (There’s a good chance that the female character’s name was Lisa or Jill.)
If I remember correctly the story starts with a woman driving when bam! A gorgeous man appears in the passenger seat dressed in early to mid 18th century apparel. One thing leads to another she freaks out, they fall in love, marry and have a child when on Christmas he goes back to his own time right before the heroines eyes. The second novel she ends up going back with their son Kitt, becomes a maid, and tries to find out what happened to her husband in her spare time. Next thing you know her employer is hosting a party and low and behold her husband is a guest.
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You think you have true love, a beautiful life, wife and kids. Then bam, your whole world is turned upside down. How do you not become a cold, heartless person. How do you ever let anyone close to you again?
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Heres the deal, during the summer this girl and I had a thing, and it was bam instant connection, we talked 24/7 got to know each other really fast and things were great. then as we got closer together she was always on me that i didnt care about anything and such, so i gave time to think and opened up more, just to show her that i cared. things were going great, we were boyfriend and girlfriend and weve fallen in love with eachother. the best relationship i can say ive had so far. but she started getting more busy, she had work and everything, and it made us have a lack of communication. I have no cell phone, and the only way i can talk to her is through AIM or myspace, or on the phone. as this situation occured, communication was going down, i waited for her to call, and got nothing. and whenever i called it was at a bad time cause she was watching TV or whatever else.She hasn’t been on the computer much either. then i confronted her about it and everything to see what was wrong, and she was telling me to quit worrying, but inside me it was odd, because back then NOTHING would stop her from talking to me, i find her pretty clingy myself, but thats what i love about her, cause it shows to me how much she wants to talk to me and everything. eventually it led to a breakup because i seemed "clingy" towards her, and all i did was care. ive let things go for a bit and now were talking again, but it just doesnt feel the same, its been on and off because one day i ignore her and she flips on me and thinks i moved on and all i did was try to prove to her im not like that, then when she does it to me in a way i get all confused, cause right now she wants the relationship just not the title. we have so much history together and im so lost on it all, all i want to do is show her that i am not clingy and want to have everything back to normal between us. I’m not sure if this is a little phase, or if shes confused on it, or anything. she hasnt lost any feelings for me, she just wants things to take slowly, and its so weird for me because when we first got to know eachother we didnt take it slow, we were constantly talking and nothing went wrong at all. any advice please?
also, it bothers me that she rarely talks to me in school. its like im almost not even there, so its very confusing because we both want this to work, but its like she has the urge to talk to me every other day
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