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- Aug 2nd 2007, 08:39 AM #1
## Ohm's Law

Hi everyone again. These problems are tough... I need help... ¡Necesito Ayuda!

In electrical theory, Ohm's law states that , where is the current in amperes, is the electromotive force in volts, and is the resistance in Ohms.

In a certain circuit V = 110 and R = 50. If V and R are to be changed by the same numerical amount, what change in them will cause to double?

First I thought it would be imperative to find the new doubled amount.

So currently we have:

Double that would be

I don't see how to make an equation to increase both the V and R by a constant number. Please help and thanks everyone.

- Aug 2nd 2007, 08:41 AM #2

- Aug 2nd 2007, 08:53 AM #3

- Aug 2nd 2007, 09:02 AM #4
It's better practice to solve for x in terms of V and R, but if that's the way you want to do it, go for it!

For reference I get

Edit: Oh dear. That makes x negative. Either my setup is wrong or there is no solution.

Edit Mark II: No, a negative x is okay because the questions says that we*change*V and R by the same amount, not add.

-Dan