On 23/11/2010 20:44, V G wrote:
> Hi all,
>
> My understanding of analog electronics is next to nothing. But it
> seems that to build a circuit of any sort, this knowledge is
> essential. Well, to build a good circuit anyway.
>
> So I have a question.
>
> Let's say that there's a power source with variable voltage. Across
> its terminals is a resistor of 10 Ohms. The power supply can only
> supply a maximum of 1 Amp.
>
> If the voltage is gradually increased, to the point where I =3D V/R>  1
> Amp, what will happen? Will Ohm's "law" not be violated?

No, as you would not be able to raise the voltage any higher than 10V=20
through the 10 ohm resistor, otherwise you would indeed violate Ohms law=20
(I would not equal V/R). You could try it if you have a bench power=20
supply - with say a 1/2W 1K resistor apply 20V for 20mA, then set=20
current limit to 10mA and the voltage should drop to 10V (make sure you=20
don't exceed the power rating of the resistor)
Simulating this stuff in say LTSpice using the current and voltage=20
sources can be quite useful for learning purposes.

--=20
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