### Author Topic: 24V to 12V  (Read 2489 times)

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#### airman00

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##### 24V to 12V
« on: August 09, 2007, 04:56:48 PM »
I have a lead battery charger whose output 24V @1.3A . To make the 24V into 12 V I just add two resistors in parallel ,rite?
Will that have any affect on the 1.3A? What values should the resistors be?
« Last Edit: August 09, 2007, 05:00:54 PM by airman00 »
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#### Soeren

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##### Re: 24V to 12V
« Reply #1 on: August 09, 2007, 05:07:02 PM »
I have a lead battery charger whose output 24V @1.3A . To make the 24V into 12 V I just add two resistors in parallel ,rite?
Will that have any affect on the 1.3A? What values should the resistors be?

I rest my case!
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### airman00

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##### Re: 24V to 12V
« Reply #2 on: August 09, 2007, 05:09:29 PM »

if you wont answer ill just see what happens when i try to do it myself.
great soeren you really helped a lot.
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#### airman00

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##### Re: 24V to 12V
« Reply #3 on: August 09, 2007, 05:16:08 PM »
oops i feel kind of stupid now...
To make the 24V into 12 V I just add two resistors in parallel ,rite?
Will that have any affect on the 1.3A? What values should the resistors be?

I typed parallel instead of in series.
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#### Soeren

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##### Re: 24V to 12V
« Reply #4 on: August 09, 2007, 05:28:44 PM »
Well, this was just ment as a comment to my advice about grabbing some books on the basics.

But your answer is "allright, then I'll go harm myself and blame you for not telling me how wrong I was"
Tsk tsk...

You can NOT get a complete education by asking questions in a public forum. Go read some books and follow some experiments in those books, then you'll learn, gradually, in a pace that makes it possible to get it to stick.

This question shows a total lack of understanding of Ohms Law and that is a non-escapeable need-to-know, so READ some BOOKS before you hurt yourself and tires everybody out.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### airman00

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##### Re: 24V to 12V
« Reply #5 on: August 09, 2007, 05:30:19 PM »
OK
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##### Re: 24V to 12V
« Reply #6 on: August 09, 2007, 05:45:43 PM »
So the equation you want to use is ohm's law:

voltage = current * resistance

So the method you want to do is HIGHLY inefficient, but would work . . .
You probably would want to use a transformer . . .

Why do you have 24 volts? Might be easiest to buy a 12V battery charger.