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Joja. Thanks . I really just enjoy it.]]>

i need to brush up my math skills. at least i know who to go to now

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I'm a long time lurker...but I just wanted to say that I admire CR for helping ppl. I've never been good at math and it's always nice to see that ppl can call on you for help! Tis all..]]>

No Prob. Glad I could help!]]>

_ConcreteRose_ wrote:Yes! P=IV V=IR So first we want them both in V= form. one of them already is, so let's get the other on P=IV (divide I from both sides) you get P/I =V and just flip it around V=P/I now you have to equations in V= form. Now how do you get V^2 from V. well V^2 is just VxV. So multiply the two V's VxV= (P/I)(IR)now simplify V^2 =PR----------------------------------------------------------------------------------------------------------------------------- and this is not important to answering the question but just to make sure, let's show that P=IV and V=IR can be written as P=I^2R P=IV V=IR well this is true because so you replace the first V with the Second V P=I(IR) P=I^2R --------------------------------------------------------------------------------- So in conclusion. We can go from P=I^2R to V^2=PR by using the two formulas V=IR and P=IV |

OMGGGGG thanks! I'm goint to save this link and copy this in my book!

And the bolded, I would have NEVER thought of that.

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Yes!

P=IV

V=IR

So first we want them both in V= form. one of them already is, so let's get the other on

P=IV (divide I from both sides) you get

P/I =V

and just flip it around

V=P/I

now you have to equations in V= form. Now how do you get V^2 from V.

well V^2 is just VxV. So multiply the two V's

VxV= (P/I)(IR)

now simplify

-----------------------------------------------------------------------------------------------------------------------------

and this is not important to answering the question but just to make sure, let's show that P=IV and V=IR can be written as P=I^2R

P=IV

V=IR

well this is true because so you replace the first V with the Second V

P=I(IR)

P=I^2R

---------------------------------------------------------------------------------

So in conclusion. We can go from P=I^2R to V^2=PR by using the two formulas V=IR and P=IV

Edited by _ConcreteRose_ - Dec 24 2013 at 3:14am]]>

More clarification--I'm trying to use algebra and these equations: "V=IR", "P=IV", and "P=I^2*R" to get "V^2/R".

I'm trying to remember only the necessary equations and manipulate them to work different problems given different information so I don't confuse myself. I think that would help me understand more than remembering every form of every equation would.

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Help a sista out.

Is there a way to get V^2=PR from P=I^2*R if V=IR? Also, P=IV

Let me know if that makes sense. I know all the formulas are tru but I'm trying to cut down on the number of formulas I have to memorize.

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