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OK. Let's go back to post 1 and look at Ohm's Law. If we're going to prove / disprove the hypothesis I've laid out, this is an excellent place to start.

I = E / R (see first post for what each stands for if you don't know already)

For the sake of simplicity, let's assume that we'd like to apply voltage to a 10,000 Ohm (10k) resistor and do the math on that. Let's consider the following voltages:

12.6V (nominal voltage of a fully charged battery)

I = 12.6V / 10,000 Ohms

I = .00126A

13.8V (healthy charging system)

I = 13.8V / 10,000 Ohms

I = .00138A

14.4V (optimistic)

I = 14.4V / 10,000 Ohms

I = .00144A

So, we can see that the formula does indeed support our hypothesis. So, now it's time to prove it - and that's the fun part.

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Tony Candela - SMD Sales & Marketing
Email me at [email protected] to learn about becoming an SMD Partner!

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OK. Let's go back to post 1 and look at Ohm's Law. If we're going to prove / disprove the hypothesis I've laid out, this is an excellent place to start.

I = E / R (see first post for what each stands for if you don't know already)

For the sake of simplicity, let's assume that we'd like to apply voltage to a 10,000 Ohm (10k) resistor and do the math on that. Let's consider the following voltages:

12.6V (nominal voltage of a fully charged battery)

I = 12.6V / 10,000 Ohms

I = .00126A

13.8V (healthy charging system)

I = 13.8V / 10,000 Ohms

I = .00138A

14.4V (optimistic)

I = 14.4V / 10,000 Ohms

I = .00144A

So, we can see that the formula does indeed support our hypothesis. So, now it's time to prove it - and that's the fun part.

doesn't the resistor have to change to stay at 10,000 ohms at 14.4v versus at 12.6v?

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It's been answered about 10 times already. Lol

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OK. Let's go back to post 1 and look at Ohm's Law. If we're going to prove / disprove the hypothesis I've laid out, this is an excellent place to start.

I = E / R (see first post for what each stands for if you don't know already)

For the sake of simplicity, let's assume that we'd like to apply voltage to a 10,000 Ohm (10k) resistor and do the math on that. Let's consider the following voltages:

12.6V (nominal voltage of a fully charged battery)

I = 12.6V / 10,000 Ohms

I = .00126A

13.8V (healthy charging system)

I = 13.8V / 10,000 Ohms

I = .00138A

14.4V (optimistic)

I = 14.4V / 10,000 Ohms

I = .00144A

So, we can see that the formula does indeed support our hypothesis. So, now it's time to prove it - and that's the fun part.

doesn't the resistor have to change to stay at 10,000 ohms at 14.4v versus at 12.6v?

A resistor is a fixed variable. So, a 10,000 Ohm resistor is a 10,000 Ohm resistor as long as it's used within the design specifications. For example, you can't use a 1/2 watt resistor where you may need to dissipate 5 watts across it.

Tony Candela - SMD Sales & Marketing
Email me at [email protected] to learn about becoming an SMD Partner!

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resistors oppose current flow not voltage. you'd have to use a substantial value of resistance to lower voltage. example would be using a resistor to get rid of amp turn on pop in Ford vehicles. to alter voltage with resistors you'd have to use it in a voltage dividing network type of scenario.

Edited by fasfocus00

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Long ago, I found this image in a textbook and used it in my presentations. Now, you can buy a t-shirt with it. Love it, and it's absolutely relevant here.

14572358_308015129575786_481446634272719

You will appreciate this then too

14724086_1169545973106877_497950785_o_zp

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  • 2 weeks later...

The momentum here was lost. I'm trying something new here in an effort that those that follow this thread may learn something that otherwise would have not been learned. It's not about me asking a question and then giving you the answer. It's not about looking the answer up in the back of the book before you do the problem. It's about solving the problem to the best of your ability and whether you get it right or wrong you learn something in the process.

If I give you the answer, nobody benefits. Still want the answer?

Tony Candela - SMD Sales & Marketing
Email me at [email protected] to learn about becoming an SMD Partner!

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