SRL Archive - Discussions & Debates

well my school had an open evening so i got to make some things and i came up with these

lets see if anyone can guess or knows what they do
Number 1.
Number 2.
have fun

~shut

ummm, so we re not given what the symbols are….this is like gr.8 science lol. xi know that theres a single ceed battery in the system, and a switch, after that i go no idea XD

Obviously a switch there, though I haven't done much high level science yet…

Resistor to switch other than that Idk…

Cut em2 it

I'm fairly sure number 1 flashes the light on and off,

iv never seen that symbol in number 2 before, the LED with a dot in the middle,
i think it shines a light and makes a noise, cause i think that other symbol is some kind of buzzer.

well yakman is the closest so far with number 2 but number 1 doesnt flash on and off

~shut

EDIT: this has nothing to do with science it is to do with electronics (unless you study electronics in science(which i dont))

The 2nd just makes the led go bright?

Circuit boards?! My dad is always trying to teach me that stuff…

We get taught these kinds of things in physics, and I fail at electricity stuff :(

From: n3ss3s
We get taught these kinds of things in physics, and I fail at electricity stuff :(

We're getting taught right now :D
EDIT: I mean… – not right NOW but… er.. :p

Ah I know this stuff if I just think a bit.. I'll edit here soon as I g2g now.

From: Zytex!
The 2nd just makes the led go bright?

it does have a led included

From: GoF
Ah I know this stuff if I just think a bit.. I'll edit here soon as I g2g now.

ok cant wait to see if you get it right

~shut

well number one has a capacitor connected in series with an led,
I'm going to assume the empty capacity has a lower resistance then the led,

i think the capacitor can act as a potential divider here, as it charges up, its resistance rises and the led gets more current.

when you first turn on the switch, most of the current flows through the capacitor and the led is dim or turned off.
as the capacitor gets filled, its resistance rises, more current goes through the led and it glows brighter.
once the capacitor is filled, nothing will discharge it (except turning off the switch)

so i was wrong, it doesnt flash, it just blinks once.


i think number 1 has the led start dim/off, then it gets steadily brighter until it reaches some maximum brightness which it will stay at.

of course the circuit doesn't tell us how big the capacitor gets filled up, it might be filled in a split second, in which case humans wont even notice the brightening of the led, or it might take years to fill, in which case humans will get bored watching.

you were close, very close
it goes on instantly but when you switch it off by the switch then it will slowly and gradually go off

well done, now for number 2 :p

~shut

From: Shuttleu
you were close, very close
it goes on instantly but when you switch it off by the switch then it will slowly and gradually go off

of course! the capacitor discharges into the led!

Wow… this stuff is so over my head :p although it has made for an interesting read :D

sorry to gravedig but can you tell me what number 2 does, since no-one worked it out, and I'd like to know.
also, hopefully explain why it does it and what those components are

From: Yakman
sorry to gravedig but can you tell me what number 2 does, since no-one worked it out, and I'd like to know.
also, hopefully explain why it does it and what those components are

Power supply, Led, Speaker (?)

From: Zytex!
Power supply, Led, Speaker (?)

Power supply (cell), L.E.D, Buzzer.

First flashes will make the LED dim-out, although it could possibly flash multiple times, depending on how you wire it, second lights the LED a produces a tone or a "click" (pretty sure it's just a click, as DC is static).