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all 23 comments

[–]aconcernedconsumer 4 points5 points ago

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Fucking logic. You can't explain that.

[–][deleted] ago

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[deleted]

[–]dsotm75 4 points5 points ago

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In this case, you are right and so is the OP. The symbol for a capacitor and a N.O. contact happen to be the same in the way the OP is using the symbol. To fix this problem in a circuit where both exist, the capacitor symbol is -)|- , and if the capacitor is polarized, there is a plus sign that sits next to the vertical line typically...at least that's how I learned it.

Nice insight though by the OP, I like it!

[–][deleted] ago

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[deleted]

[–]dsotm75 0 points1 point ago

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There's so much to learn though if you are an EE student, or an EET student...don't be so hard on yourself, there's just tons and tons and TONS of info to learn

[–][deleted] ago

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[deleted]

[–]DerikTheDwarf 1 point2 points ago

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ECET major here. I should've thought of this on my final last semester.

[–]theRedErik 0 points1 point ago

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Due to what they represent, N.O. contacts will be utilized in digital circuit diagrams, whereas capacitor symbols are much more likely to be found in analog circuit diagrams. I was taught that the -)|- symbol was utilized in analog circuit diagrams to show a tantalum capacitor (low leakage and high capacity, named for what they're made of http://en.wikipedia.org/wiki/Tantalum_capacitor). A normal capacitor could be used in other instances.

[–]TheGizmojo 1 point2 points ago

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I don't see anything wrong here.

[–]intensely_human 1 point2 points ago

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Because a capacitor is like a spring. DC is like a constant force on that spring. It moves a certain distance and then stops because the spring resists more as it gets further from its neutral point. AC is like a vibration on that spring. Since the vibration takes the spring back and forth over its neutral point, it stays "within" a distance where the spring's resistance isn't enough to stop the vibration.

[–]stfm 1 point2 points ago

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Partial credit

[–]zirazira 1 point2 points ago*

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A capacitor is like an accumulator in a hydraulic system. It evens out fluctuations and acts as a storage for pressure (electrical potential). Electrical current does not flow through a capacitor, it is stored in it. You can charge a capacitor with voltage as was the case in older model cars with a points and capacitor distributor. The voltage, about 12-13.5 volts comes from the battery and charges the capacitor. When the cam on the distributor shaft opens the points it causes a pulse of current into the coil which steps it up to 15k+ volts, sends the voltage down the coil wire to the distributor, through the rotor inside the distributor cap and out the appropriate wire to the spark plug. Once at the plus the voltage is looking for a ground which it finds by jumping the plug gap and grounding to the engine block.

Capacitors, to the best of my old knowledge, do not work with AC voltage. Since AC cycles what is put into the capacitor one cycle is taken out the other. You need a constant electrical potential to charge the capacitor. When this potential is removed the charge will remain until it finds its way back to ground.

[–]Funkhauzer 0 points1 point ago

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DC will charge a capacitor but once it is charged it no longer will pass current.

Capacitors act as a conductor with AC voltage. Capacitive reactance ( resistance to current flow) is inversely related to frequency. A frequency of 0 (DC) means infinite resistance and therefore no current can flow.

[–][deleted] 0 points1 point ago

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NOW I get it!

[–]mindlessdrone91 0 points1 point ago

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Obligatory cock-block joke.

But, as an undergraduate physics major, thanks for the insight! Have an upvote.

[–]hacksoncode 0 points1 point ago

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Surprisingly insightful, actually.

[–]GentleHat 0 points1 point ago

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Where...Where are the AC/DC references?

[–]gevander -4 points-3 points ago

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I'm not an EE, but...
Don't both AC and DC have a frequency? If yes, then the first images on that page should also be waveforms. Then the reason for why one is stopped and the other is not might be the amplitude or frequency of the wave.

Just spitballing.

[–]ninepointsix 4 points5 points ago

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I'm pretty sure DC doesn't have a frequency. If it does your rectifier is not doing a very good job.

[–]WarPhalange 5 points6 points ago

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It does. The frequency is zero.

[–]IrishSchmirish 5 points6 points ago

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Kenneth?

[–]WarPhalange 0 points1 point ago

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Nope.

[–]rib-bit 0 points1 point ago

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don't fuck with me

[–]kspacey 0 points1 point ago

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this.

[–]mbzastava 1 point2 points ago

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lol @ this ^

universities need to start offering courses on "spitballing"

[–]greenmysteryman 1 point2 points ago

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with a zero frequency you can't have a vector potential which is actually the thing that is transmitted through the capacitor.