/diy/ - Do It Yourself

[Anonymous No.1333037]

If the return circuit is severed, will the bulb still light up?

[Anonymous No.1333038]

>>1333037
No.

[Anonymous No.1333049]

>>1333037
This is my first time i have ever come to /diy/ I was going to create a thread about what kinds of things you can do with a shipping container but yet the first thread i see is asking if a light bulb will light up if the return circuit is severed?

[Anonymous No.1333052]

>>1333049
>use it for your imitation crab meat storage needs

[Anonymous No.1333069]

>>1333049
Welcome to /diy/. No one here does anything actually, especially not building.

[Anonymous No.1333078]

>>1333037
not with DC

[Anonymous No.1333080]

>>1333078

[Anonymous No.1333090]

>>1333037
>conventional current
gross

[Anonymous No.1333097]

I just had a Rueben sandwich

[Anonymous No.1333190]

>>1333037
No. Current needs to flow through to make a complete circuit. A normal light switch will usually switch the positive (or live if mains) because it's safer to leave the neutral connected and the hot disconnected. But the switch will work perfectly well if you put it between the negative side. Also this is a problem that should be very easy to find elsewhere. Have a look at the hydraulic analogy to get a intuitive understanding of electric current, and don't forget Ohm's law and P=IV. After that kirchoff's laws help with circuit analysis if you plan on doing that, as does Millman's theorem, and complex numbers + phasors if you plan on going into alternating current.

>>1333078
Firstly, it's a battery. Secondly, your parasitic capacitance won't give enough current for the bulb to "light up" unless you're packing some serious MHz.

[Anonymous No.1333192]

>>1333037
>>1333190
Also /diy/ and /sci/ both have SQT or QTDDTOT (stupid questions thread) and (questions that don't deserve their own thread) threads, which this sort of post should be directed to in the future.

[Anonymous No.1333202]

>>1333190
>hydraulic analogy

>have pipes running from water mains to sink to sewers
>sever drain pipe
>water stops flowing from faucet

[Anonymous No.1333213]

>>1333097
Go home, Adam

[Anonymous No.1333280]

>>1333037
Why don't you try it and find out

[Anonymous No.1333285]

>>1333037
Electricity needs to go THROUGH the light bulb, that means IN and OUT.

If there is not an IN and OUT the electricity can not flow. It passes from the + to the - and that movement is what makes everything happen.

[Anonymous No.1333288]

>>1333037
it won't light up, because current cannot do any "work" on that bulb

think of current as a band, what would happend if you cut one side of the band?

[Anonymous No.1333309]

>>1333202
The hydraulic analogy requires that there is no "outside" that something like a faucet would flow into, because it allows air to replace the otherwise incompressible fluid. Pressure in the hydraulic system is akin to voltage, and allowing an external source of pressure like the atmosphere to interfere breaks the model. If instead of a faucet you have a turbine that spins up a belt sander or some other load, cutting the return will definitely stop the flow. But note that a hydraulic pump is closer to a current source than voltage source (pressure will climb when blocked), for a voltage source you want a gravity-fed head, or something closer to your water mains.

The model only really breaks down when you try to make a charge pump (boost converters work fine), though I'm unsure about a full bridge rectifier powering a load off an alternating pressure source.

[Anonymous No.1333329]

>will the bulb still light up?
yes

[Anonymous No.1333372]

>>1333329
No

[Anonymous No.1333375]

>>1333285
>that means IN and OUT.

well fuck. now I need a burger.

[Anonymous No.1333392]

you know whats funny is everyone who replied to OP just basically got trolled by the OP. you people are dumb

[Anonymous No.1333396]

>>1333392
>you people are dumb

and you seem new. we're bored, for the most part, and when we take an obvious bait post seriously we're just adding to the troll.

have a tasty snack on the house.

[Anonymous No.1333413]

>From Positive to Negative

That's not actually how it works. If you want to think of it in terms like that then the electricity actually comes out of the negative terminal.

[Anonymous No.1333419]

>>1333413
no it doesn't you don't even need minus connected

[Anonymous No.1333426]

>>1333396
>have a tasty snack on the house.
that's for 2+ people right?

[Anonymous No.1333440]

>>1333419
>>1333396
>>1333392
>>1333372
>>1333288
>>1333285
>>1333280
>>1333192
>>1333190
>>1333038

OP here. This wasn't a troll. I have a 15 year old ceiling light out. A voltage tester showed the 'in' line was fine, which is why I was asked the question about the 'out' line. I was trying to get a good idea if it was the fixture or the wiring, since we had some water damage around that area a year ago and it's probably not in the best shape. All the other ceiling lights are working fine, and I figured if one line was damaged all the ceiling lights (or at least more than 1) would not be working. I just wanted to get all the info I could before replacing the fixture.

Anyway, thank you for those that gave good information. I'll be sure to stick to the stupid-questions thread in the future.

[Anonymous No.1333441]

No, it’s called a circuit for a reason

[Anonymous No.1333460]

>>1333440
A voltage tester only needs to be connected the phase.
Why didn't you fucking retard describe the problem you retarded cockcsucker instead of posting a car battery.

[Anonymous No.1333466]

>>1333460
Just a guess, but probably because 98% of 4chan doesn't read long posts and wants to be able to get the gist of a post in a single glance or they ignore it.

[Anonymous No.1333469]

>>1333069
actually poor and mad blue collar cucks make reddit tier AMA threads and think they don't have shitty jobs

[Anonymous No.1333472]

>>1333466
nah, lots of retards make threads here without explaining anything properly

[Anonymous No.1333626]

I know the answer because my dad is a TV repair man.
The round earth believers will tell you no, the light will not work.
But the flat earth realists know the light will work.
You can thank me later.

[Anonymous No.1333639]

>>1333049
bury it and make a fallout shelter

[Anonymous No.1333654]

/diy/ has these people and these people only:

>I'm too poor to really do any diy
>I'm too busy working to really do any diy
>After many years I'm good at x and have the tools to do x good, but not much else
>I'm rich and bought a house, but no clue how to fix

[Anonymous No.1334134]

>>1333426
>he doesn't eat 2kg fries fried in tallow with mayonnaise and ketchup plus putting 10 burgers on top of a familiar size ordered pizza and then putting another pizza upside down on top so it closes like a sandwich and then drinking up to 2 liters of coke as a regular meal

lmao, if you think this is too much or something you must be some kind of 3rd world starving poo in loo.

[Anonymous No.1334222]

>>1333090
Its actually direct current

[Anonymous No.1334342]

>>1334222
I isn't if you casually change the polarity 50 times per second.

[Anonymous No.1334368]

>>1333654
Which one are you?

[Anonymous No.1335467]

>>1333639
DONT DO THIS, THEY ARE MADE FOR LOAD ONLY ON THE CORNERS, THE SIDES WILL CAVE IN WHEN YOU BACKFILL OR MAYBE LATER ON RESULTING IN YOUR DEATH. YOU HAVE BEEN WARNED.....

[Anonymous No.1335605]

>>1335467
>>1333037
>>1333078
>>1333090
>>1333190
>>1333639

Hahaha oh this thread

[Anonymous No.1335606]

>>1334368
Not p. But im the mix of the first two

[Anonymous No.1335611]

>>1333037
electrons flow from the negative desu senpai

[Anonymous No.1335748]

>>1333078
He's right you know. With AC it will light every half cycle so it would be only half as bright.

[Anonymous No.1335751]

>>1334342
Fucking brits

[Anonymous No.1335889]

>>1335751
Well statistically speaking, it's most countries in the world. Not to mention both China and India. 60Hz-country people are a minority.

[Anonymous No.1335968]

theoretically speaking, no, having said that i've seen led's light up slightly in certain situations when plugged into messy breadboard setups and only one lead was connected at the time. that was strange.

[Anonymous No.1336105]

>>1335968
static maybe

[Anonymous No.1336411]

>>1335968
LEDs can pick up enough RF in their leads to power themselves.
See: Rectenna