Ohm's Law 2
From High School Online Collaborative Writing
"Ohm's law (ōm) [for G. S. Ohm], law stating that the electric current i flowing through a given resistance r is equal to the applied voltage v divided by the resistance, or i=v/r. For general application to alternating-current circuits where inductances and capacitances as well as resistances may be present, the law must be amended to i=v/z, where z is impedance. There are conductors in which the current that flows is not proportional to the applied voltage. These do not follow this law and are called nonohmic conductors." -Encyclopedia http://www.answers.com/library/Encyclopedia;jsessionid=mhoa5hdxu7xy-cid-246964442-sbid-lc01a
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[edit] Explanation
Resistance and Ohm’s Law relate, since resistance is the property that determines how much current will flow. Such as is you have two conductors that have some kind of potential difference and if they are connected with some sort of copper rod you can create a large current. Although if you put a glass rod in the place of the copper rod, then you will probably create no current. As we all know is Ohm’s Law does consist of an equation that uses resistance therefore we can clearly say when we think of Ohm’s Law we can think of resistance. The equation is:
R= V/I
R stands for resistance that equals the ratio that shows the potential difference between the conductors, V that is volts and I stands for current.I which stands for current is measured in amperes. The Potential difference which is V is measured in volts. The resistance or the conductor is measured of course in ohms. Now we are thinking how do these thing relate?
For example if you have a resistance of one ohm that has a current of one amp to conduct through the circut at a potentail difference of 1V. Also if you have a circut with a 6-V battery is connected to a 2 ohm light bulb. The current should measure 3-A.
[edit] Pictures
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[edit] History
Scientist Georg Simon Ohm is German, he discovered the ratio potential difference to the current is always a constant for any given conductor. The resistance for most conductors does not really vary as the magnitude or the direction of any potential energy that is applied to it changes. Supposedly most metallic conductors follow Ohm's Law. Although there are those devices that do not follow the Law, such as transistor radios or pocket calcualtors. These items do not follow the Law because these small devices such as transistors and diodes that do not follow the Law. Even a lightbulb doesnt always follow the Law because a light bulb has a resistance that depends on voltage and does not follow Ohms Law.
[edit] Sources
- Zitzewitz, Paul, "Glencoe Physics Principles and Problems",1999,Glencoe/ McGraw-Hill 8787 Orion Place Columbus, OH 43240
![[1]](http://www.cns.cornell.edu/cipt/labs/images/Ohms_Law_pic2-lg.jpg){kind=link}