Ohm's law

[Mecca]

I have been researching the ohm's law, but I'm not really getting it. Can anyone break it down
to make understanding it better.

 

[AzPlumber]

V = I x R

In this formula, V stands for voltage (in volts), I stands for current (in amperes), and R stands for resistance (in ohms).

eta: or

I = V/R

R = V/I

 

[iamthevoice]

And if you remember how to balance an equation, you can easily switch the variables around to see exactly how the relationship works!

Don't laugh, but this is an excellent explanation: Physics for Kids: Ohm's Law

And welcome to ECF, by the way!

 

[Bunnykiller]

ohms law....
there is resistance ( ohms)
there is voltage ( pressure)
and there is amps ( flow)

ever try to squirt water out of a really thin straw? and if you have did you notice how little water came out compared to a really big fat straw?
the thin straw is high resistance ( hi ohms), the amount of water that went thru the skinny straw was minimal since the straw was so thin and to get more water thru the thin straw required more pressure. wala more volts (pressure) into a thin straw ( hi resistance) gives you the same flow ( amps) as if you had a fat straw ( less resistance) with less pressure ( voltage)....

 

[WilsonR]

And if you remember how to balance an equation, you can easily switch the variables around to see exactly how the relationship works!

Don't laugh, but this is an excellent explanation: Physics for Kids: Ohm's Law

And welcome to ECF, by the way!

This was an easy to dumb it down for those who don't understand. I was clueless until I read that. Now it makes sense. Thank you.

 

[Susan~S]

Here's another resource by Baditude (our battery/safety expert): Ohm's Law for Dummies (Vapers)

 

[realsis]

You can get a android app called ohms law and this app does ALL the calculations for you. It's a wonderful app and seeing the app work will help you understand how the math works. It's a free app from the play store simply called ohms law. It does all the calculation you will need for you. Once you see the formula worked it will help you understand. The app is really handy for people who don't like math.

 

[Pinggolfer]

This may be helpful.

http://www.ecigadvanced.com/community/wp-content/uploads/2012/07/power.jpg

 

[Andrew H]

Welcome to ECF

 

[grombor1978]

Hmm, I'm thinking, if you had a really thin straw, with REALLY HIGH pressure, and the line could contain the pressure....couldn't you cut through steel with it better then a really fat straw?

 

[Kimmothy]

My strengths in school were English and History...never thought I'd be trying to learn science and math. By choice, no less.

 

[classwife]

Moved to New Members from Simple Solutions

 

[AzPlumber]

Hmm, I'm thinking, if you had a really thin straw, with REALLY HIGH pressure, and the line could contain the pressure....couldn't you cut through steel with it better then a really fat straw?

Not sure what this posters intent is but this is called power or watts.

 

[DingerCPA]

Welcome aboard!

Me likes dealing with numbers....

If I have a 2 ohm resistor and 4V going across it, then I'm going to draw 2 Amps of current - I = V/R (amps = Volts/ohms) Amps = 4Volts/2ohms = 2 amps

Watts.... W = V*V/R. W = 4*4/2 = 8 watts

Change the resistance to 1.5 ohms

I = 4/1.5 = 2.67 Amps
W = 4*4/1.5 = 10.67W

8 Watts - cooler vape
10.67 Watts - warmer vape

Basically, on a fixed voltage battery, you pick a resistance and everything else gets calculated for you. On a variable voltage/wattage device, you get some latitude on playing with the settings to determine what your end results may be.

Hope that helps

 

[tj99959]

Isn't this fun, we even get to be rocket scientists just because we want to vape instead of smoking.

 

[autobiogphnation]

Doesn't get any simpler than that.

 

[rusirius]

Just a reminder... Just cause I like to nit pick... Ohm's law deals with Voltage, Resistance and Current... Notice what's missing? Watts... Power... For that we need Joule's law... Poor Joule... He gets shoved in the corner with little to no recognition by the vaper crowd.. They take his formula P = V * I and combine it with Ohm's law I = V/R to get some of our highly used equations of P = V^2 / R.. and yet we lump it under "Ohm's Law"...

It's a sad sad day for James Joule...

 

[Steamix]

Yep, add dual coil calculations, and it'll be the last straw

 

[Steamix]

Oh, and lest I forget: hydrodynamics and viscosity expertise plus some passing knowledge of airflow management ... we make a vaper out of you yet

 

[Baditude]

Doesn't get any simpler than that.

That makes no sense to me at all; but then I hated math and physics. Common everyday people have no idea how that chart works.