Difference between revisions 5418602 and 5418607 on simplewiki

'''Ohm's law''' says that in an [[electrical circuit]], the [[Electric current|current]] passing through a [[resistor]] between two points, is related to the [[voltage]] difference between the two points, and inversely related to the [[electrical resistance]] between the two points. This relation is shown in the following formula:
:<math>R = \frac VI</math>
Where I is the current in [[ampere]]s, ''V'' is the potential difference in [[volt]]s, and ''R'' is a constant, measured in [[ohm]]s, called the [[electrical resistance|resistance]].

Also says that current is directly proportional to voltage loss through a resistor. That is if current doubles then so does voltage.
To make a current flow through a resistance there must be a voltage across that resistance. Ohm's Law shows the relationship between the voltage (V), current (I) and resistance (R). It can be written in three ways: 
:<math>I = \frac{V}{R} \quad \text{or}\quad V = IR \quad \text{or} \quad R = \frac{V}{I}</math>.

== Current,  Voltage, and  Resistance ==

=== Voltage ===
Voltage is how much energy is between two points on a circuit. These two points have different charges, one is higher and the other is lower. The difference between these two points of the charge is how we measure the voltage.  The unit of “volt” is name of the Italian physicist Alessandro Volta who created the first chemical battery.  The letter “V” represents voltage.

=== Current ===
(contracted; show full)

==Other websites==
* [http://www.allaboutcircuits.com/worksheets/ohm_law.html Ohm's Law worksheet] on All About Circuits
* [http://max-iskram.rhcloud.com/?page_id=26 '''Ohm Law''']: Electronics for Beginners
* [http://www.elektro-energetika.cz/calculations/ohm_zak.php?language=english Calculator - Ohm's law in the DC circuit]

== References ==
[[Category:Electricity]]