Science Fair Project Encyclopedia
Ohmic device
An ohmic device exhibits the following relationship between resistance, voltage, and current:
R = V / I
(This is Ohm's Law.) This means that the resistance of an ohmic device is independent of the voltage applied across it. If a graph of voltage vs. current was plotted for a specific ohmic device, the graph would be a straight line, and the slope of this line would be the device's resistance. Note, however, that current vs. voltage graphs (or "I-V diagrams") are more common; in which case the resistance is the inverse of the slope.
In reality, there cannot be truly ohmic devices, such as ideal resistors. Common non-ohmic devices are light bulbs and diodes.
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details