Would a LED short itself?

[Mr. Man-wai Chang]

Any professor/PhD level explanations?

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[Tom Biasi]

On 6/27/2013 12:08 PM, Mr. Man-wai Chang wrote:

Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

 

[Mr. Man-wai Chang]

On 28/06/2013 12:11 AM, Tom Biasi wrote:

On 6/27/2013 12:08 PM, Mr. Man-wai Chang wrote:

Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

Is it nothing more than a light bulb?

Would you use a current-limiting resistor when you use traditional light
bulb?

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
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[Mr. Man-wai Chang]

On 28/06/2013 12:11 AM, Tom Biasi wrote:

It wouldn't. Someone would have to do something to it.

OK, are there 20mA fuses? Isn't a fuse safer than a resistor?

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
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[Jim Thompson]

On Thu, 27 Jun 2013 12:11:03 -0400, Tom Biasi <tombiasi@optonline.net>
wrote:

On 6/27/2013 12:08 PM, Mr. Man-wai Chang wrote:

Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

It depends on the definition of "LED" >:-}

...Jim Thompson
--
| James E.Thompson | mens |
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| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Mr. Man-wai Chang]

On 28/06/2013 12:16 AM, Mr. Man-wai Chang wrote:

Would you use a current-limiting resistor when you use traditional light
bulb?

And a traditional light bulb could be powered by 110/220 V AC... isn't
it extremely dangerous not to use a current-limiting resistor?

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
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[Mr. Man-wai Chang]

On 28/06/2013 12:33 AM, Jim Thompson wrote:

Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

It depends on the definition of "LED" >:-}

Tell me something I dunno!

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
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[Tom Biasi]

On 6/27/2013 12:16 PM, Mr. Man-wai Chang wrote:

On 28/06/2013 12:11 AM, Tom Biasi wrote:
On 6/27/2013 12:08 PM, Mr. Man-wai Chang wrote:

Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

Is it nothing more than a light bulb?

Would you use a current-limiting resistor when you use traditional light
bulb?

An LED is not a light bulb, it's a diode. Light bulbs (as understood to

be incandescent by the tone of this conversation)are resistive and
designed to operate at certain voltages.

 

[Tom Biasi]

On 6/27/2013 12:20 PM, Mr. Man-wai Chang wrote:

On 28/06/2013 12:11 AM, Tom Biasi wrote:
It wouldn't. Someone would have to do something to it.

OK, are there 20mA fuses? Isn't a fuse safer than a resistor?

May I suggest that you examine the function of those two devices?

 

[Michael Black]

On Fri, 28 Jun 2013, Mr. Man-wai Chang wrote:

On 28/06/2013 12:11 AM, Tom Biasi wrote:
On 6/27/2013 12:08 PM, Mr. Man-wai Chang wrote:

Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

Is it nothing more than a light bulb?

Would you use a current-limiting resistor when you use traditional light
bulb?

I think you need the newsgroup that's even lower than basics.

An incandescent lightbulb uses a relatively high resistance wire, power
put through that wire causes it to light up. If that lightbulb goes bad,
it would generally open up. The only way it could short is if the
filament collapses on some of the lower wire in just the right way, but if
the bulb was on at the time, the power would just burn out the wire that
remained, too much current going through regular wire.

An LED is a solid state device. There may be instances when they might
short out, but generally they'd just expire, leaving an open circuit.

The resistor that all LEDs need (except for the LEDs that have some
current limiting inside the package) is because the LED is a current
device, it needs a certain amount of current to light up (so long as the
voltage is higher than it's threshold, and lower than the maximum it can
take). If too much current goes into the LED, it can "blow up". It is
different from an incandescent bulb.

Sometimes people do use resistors in series with incandescent bulbs. They
want to limit the current surge through the bulb before the resistance
goes up as it heats up. Or, to limit the actual light out of the bulb,
though there are better ways to do that.

Michael

 

[Mr. Man-wai Chang]

On 28/06/2013 12:44 AM, Michael Black wrote:

An LED is a solid state device. There may be instances when they might
short out, but generally they'd just expire, leaving an open circuit.

What exactly are those instances?

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
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^ ^ 00:42:01 up 6:23 0 users load average: 0.00 0.01 0.05
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[Mr. Man-wai Chang]

On 28/06/2013 12:41 AM, Tom Biasi wrote:

On 6/27/2013 12:20 PM, Mr. Man-wai Chang wrote:
On 28/06/2013 12:11 AM, Tom Biasi wrote:
It wouldn't. Someone would have to do something to it.

OK, are there 20mA fuses? Isn't a fuse safer than a resistor?

May I suggest that you examine the function of those two devices?

You meant I should use both a limiting resistor as well as a 20mA fuse?

--
@~@ Remain silent. Nothing from soldiers and magicians is real!
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (Fedora 18 i686) Linux 3.9.6-200.fc18.i686
^ ^ 00:48:01 up 6:29 0 users load average: 0.00 0.01 0.05
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[Tom Biasi]

On 6/27/2013 12:49 PM, Mr. Man-wai Chang wrote:

On 28/06/2013 12:41 AM, Tom Biasi wrote:
On 6/27/2013 12:20 PM, Mr. Man-wai Chang wrote:
On 28/06/2013 12:11 AM, Tom Biasi wrote:
It wouldn't. Someone would have to do something to it.

OK, are there 20mA fuses? Isn't a fuse safer than a resistor?

May I suggest that you examine the function of those two devices?

You meant I should use both a limiting resistor as well as a 20mA fuse?

No, I mean you should learn what those devices are for.

 

[Rich Webb]

On Thu, 27 Jun 2013 17:40:51 +0000 (UTC), asdf <asdf@nospam.com>
wrote:

On Fri, 28 Jun 2013 00:16:59 +0800, Mr. Man-wai Chang wrote:

Would you use a current-limiting resistor when you use traditional light
bulb?

A traditional light bulb IS a current limiting resistor.

More of a Light Emitting Resistor (LER) isn't it? ;-)

 

[asdf]

On Fri, 28 Jun 2013 00:16:59 +0800, Mr. Man-wai Chang wrote:

Would you use a current-limiting resistor when you use traditional light
bulb?

A traditional light bulb IS a current limiting resistor.

 

On Thursday, June 27, 2013 10:51:58 AM UTC-7, Rich Webb wrote:

On Thu, 27 Jun 2013 17:40:51 +0000 (UTC), asdf <asdf@nospam.com

wrote:



On Fri, 28 Jun 2013 00:16:59 +0800, Mr. Man-wai Chang wrote:



Would you use a current-limiting resistor when you use traditional light

bulb?



A traditional light bulb IS a current limiting resistor.



More of a Light Emitting Resistor (LER) isn't it? ;-)

Yes! I like it! Henceforth we must call all incandescent light bulbs Light Emitting Resistors!

Oh, wait, by that definition some electric space heaters would also qualify as Light Emitting Resistors, huh.

 

[asdf]

On Thu, 27 Jun 2013 13:51:58 -0400, Rich Webb wrote:

Would you use a current-limiting resistor when you use traditional
light bulb?

A traditional light bulb IS a current limiting resistor.

More of a Light Emitting Resistor (LER) isn't it? ;-)

Those bulbs once used in wien bridge sinewave generators would qualify:^)

 

[Michael A. Terrell]

mrdarrett@gmail.com wrote:

On Thursday, June 27, 2013 10:51:58 AM UTC-7, Rich Webb wrote:
On Thu, 27 Jun 2013 17:40:51 +0000 (UTC), asdf <asdf@nospam.com

wrote:



On Fri, 28 Jun 2013 00:16:59 +0800, Mr. Man-wai Chang wrote:



Would you use a current-limiting resistor when you use traditional light

bulb?



A traditional light bulb IS a current limiting resistor.



More of a Light Emitting Resistor (LER) isn't it? ;-)

Yes! I like it! Henceforth we must call all incandescent light bulbs Light Emitting Resistors!

Oh, wait, by that definition some electric space heaters would also qualify as Light Emitting Resistors, huh.

They come in infrared, red, orange and yellow. It's time to replace
them when they emit blue light. ;-)

 

[Rheilly Phoull]

On 28/06/13 00:33, Mr. Man-wai Chang wrote:

On 28/06/2013 12:33 AM, Jim Thompson wrote:
Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

It depends on the definition of "LED" >:-}


Tell me something I dunno!

Something about your posts makes me think "TROLL" as you seem to know it

all, why bother asking your inferiors ?? (In particular comparing an
incandesent lamp to an LED).

 

[John Fields]

On Fri, 28 Jun 2013 00:33:59 +0800, "Mr. Man-wai Chang"
<toylet.toylet@gmail.com> wrote:

On 28/06/2013 12:33 AM, Jim Thompson wrote:
Any professor/PhD level explanations?

It wouldn't. Someone would have to do something to it.

It depends on the definition of "LED" >:-}


Tell me something I dunno!

---
So far, that part's been easy.

The difficult part seems to be getting you to understand some simple
concepts.

--
JF