Led on 24v dc

[Basil]

Hi there all,

I want to use a LED on 24v DC what formula do i use to calculate what
resistor i need...?


the LED is a 10mm..... 30mA..... 2 volts


thankyou all

 

[Phil Allison]

"Basil"

I want to use a LED on 24v DC what formula do i use to calculate what
resistor i need...?

the LED is a 10mm..... 30mA..... 2 volts

** Ohm's law.


BTW How is Mrs Fawlty ?




............ Phil

 

[Franc Zabkar]

On Thu, 7 Oct 2004 18:16:53 +1000, "Basil" <bkurt@net2000.com.au> put
finger to keyboard and composed:

I want to use a LED on 24v DC what formula do i use to calculate what
resistor i need...?


the LED is a 10mm..... 30mA..... 2 volts

R = (Vsupply - Vled) / Current
= (24 - 2) / 30
= 0.733 Kohm
= 733 ohm


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[Lord Garth]

"Franc Zabkar" <fzabkar@optussnet.com.au> wrote in message
news:c32am0ljkg5ubems9i53r1gvv0erd0s3s6@4ax.com...

On Thu, 7 Oct 2004 18:16:53 +1000, "Basil" <bkurt@net2000.com.au> put
finger to keyboard and composed:

I want to use a LED on 24v DC what formula do i use to calculate what
resistor i need...?


the LED is a 10mm..... 30mA..... 2 volts

R = (Vsupply - Vled) / Current
= (24 - 2) / 30
= 0.733 Kohm
= 733 ohm


- Franc Zabkar

Don't forget the power rating!!!

P=I˛R
P=(.03*.03)*733
P=.6597W
Use a 1 watt resistor or it will burn up.

 

[Albm&ctd]

On Thu, 07 Oct 2004 23:24:15 GMT, "Lord Garth" <LGarth@Tantalus.net>
wrote:

"Franc Zabkar" <fzabkar@optussnet.com.au> wrote in message
news:c32am0ljkg5ubems9i53r1gvv0erd0s3s6@4ax.com...
On Thu, 7 Oct 2004 18:16:53 +1000, "Basil" <bkurt@net2000.com.au> put
finger to keyboard and composed:

I want to use a LED on 24v DC what formula do i use to calculate what
resistor i need...?


the LED is a 10mm..... 30mA..... 2 volts

R = (Vsupply - Vled) / Current
= (24 - 2) / 30
= 0.733 Kohm
= 733 ohm


- Franc Zabkar

Don't forget the power rating!!!

P=I˛R
P=(.03*.03)*733
P=.6597W
Use a 1 watt resistor or it will burn up.

Be damned hard finding the exact resistor use 860 ohm and if it is

in a vehicle with 24v then 1K as the voltage gets up to about 29
volts.

Al
2004 insult page awaits your contribution
http://kwakakid.cjb.net/insult.html

 

[Howard Latham]

"Albm&ctd" <alb_mandctdNOWMD@connexus.net.au> wrote in message
news:2sn7huF1ngg25U5@uni-berlin.de...

On Thu, 07 Oct 2004 23:24:15 GMT, "Lord Garth" <LGarth@Tantalus.net
wrote:


"Franc Zabkar" <fzabkar@optussnet.com.au> wrote in message
news:c32am0ljkg5ubems9i53r1gvv0erd0s3s6@4ax.com...
On Thu, 7 Oct 2004 18:16:53 +1000, "Basil" <bkurt@net2000.com.au> put
finger to keyboard and composed:

I want to use a LED on 24v DC what formula do i use to calculate what
resistor i need...?


the LED is a 10mm..... 30mA..... 2 volts

R = (Vsupply - Vled) / Current
= (24 - 2) / 30
= 0.733 Kohm
= 733 ohm


- Franc Zabkar

Don't forget the power rating!!!

P=I˛R
P=(.03*.03)*733
P=.6597W
Use a 1 watt resistor or it will burn up.

Be damned hard finding the exact resistor use 860 ohm and if it is
in a vehicle with 24v then 1K as the voltage gets up to about 29
volts.

No, in the case of 24 volt vehicle , where the voltage may go up to 29
volts,

regulate to 18 volts and redo calculation on 18volts.