Revision 6757756 of "User:16chseld 604/sandbox" on simplewiki

{{class project|teacher=swim123blue|link=Wikipedia:Schools/Projects/easell}}
'''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 ===
Current is how fast the charge is flowing. The higher the charge, the faster the current. Basically Current just electrons flowing in a circuit, and current is measure how fast the electrons go, The unit of the current is “ampere” , and usually can write it as “amps”. The letter “I” can represent as current.1

=== Resistance ===
Resistance is something to resist the flow of the charge, to make sure they not flow too fast and break the circuit. In a circuit, light bulb can be a resistor, that electron through the light bulb, and the light bulb will light up, and if the resistance is high, then the light will be darker. The unit of resistance is “Ω”,  which is called omega, and pronounced “ohm”, it is the name of the inventor of Ohm’s law.<ref>{{Cite web|url=https://learn.sparkfun.com/tutorials/voltage-current-resistance-and-ohms-law|title=Voltage, Current, Resistance, and Ohm's Law|first=CTaylor|last=|date=|website=sparkfun|publisher=SparkFun Electronics|accessdate=10 June 2016}}</ref>

== How Current, Voltage, and Resistance are related==
Current, Voltage, and Resistance are related, which is call it “Ohm’s law”. Ohm defines the unit of resistance of “1 Ohm” as the resistance between two points in a conductor where the application of 1 volt will push 1 ampere, or 6.241×10^18 electrons.<ref>{{Cite web|url=http://www.allaboutcircuits.com/textbook/direct-current/chpt-2/voltage-current-resistance-relate/|title=How Voltage, Current, and Resistance Relate|first=|last=|date=6 June 2016|website=all about circuit|publisher=EETech Media, LLC|accessdate=10 June 2016}}</ref> 

== Find all values in the circuit ==
[[File:Circuit_1.jpg|459x459px|Circuit 1]]

For example, a scientist know the value of the voltage is 20V, and you also know the resistance which is the light bulb, is 10 Ω. And you going to fine the other unknown variable which is the current. You use the ohm’s law formula     . We see that wa know two variable already which are V(voltage) and R(resistance), so the only variable you need to fine is I(current).

'''20V= 10Ω * I'''

'''I = 2A'''

In a problem, a scientist always gets enough information to solve the others values, the only thing a scientist has to memorize is the Ohm’s law formula, and plug it in what is given, and solve the unknown one. And also a scientist needs to understand the concept, like which is current, which is voltage, and which is resistance.

==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 ==