Friday, February 10, 2012

Voltage , Resistance and current

Now, this topic is about Voltage , Resistance , current and how these three are connected .
First at the bus stop is the meaning of each .


What is Voltage ?  ( V )
Voltage is the potential difference between two points . The unit of measure of this is Volts
It is how high and how many electricity a body contains to be able to produce a specific amount of force ,

WHICH GREATLY AFFECTS THE : 

Electric current ( I )
Electric current is the rate at which charges pass a given point . The unit of measure given for the current is Amperes .

Now to slow down the current that would eventually stop it , is the : 


Resistance ( R )
by it's root word "resist" , resistance usually means the opposition presented to the current by a material or device .

This means that if the Voltage is increases the current also increases ,
If the Resistance increases then the current decreases

Now how do we Calculate the voltage , and the Resistance ?

AS we can see in the triangle :
V= Voltage ; I = current and R= Resistance
therefore : Voltage is equal to Resistance times Amperes ( current ) 
or , V=  I x R , Voltage is directly proportional to the current ( both increases )

therefore : Resistance is inversely proportional to the current ( if R increases , I  decreases )
R= V divided by I [ R= V/ I ] 

- End of Topic -


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