Tuesday, September 14, 2010

Notes from p.553~563

◎Electrical resistance is a material's opposition to the flow of electric current and it's measured in Ohms (Ω)

◎ Circuit with a boarder pathway and narrow pathway is different by the current flow, there're more current pass though a circuit with a boarder pathway than a circuit with a narrow pathway

◎The resistance of a conductor depends on things such as, its length, cross-sectional area, the material it is made of , and its temperature.















Series circuit is the circuit which the loads are connected one after another in a single path.
If two or more components are connected in parallel they have the same potential difference across their ends, that's parallel circuit and they are side by side.
←◎Georg Simon Ohm is the person  who discovered that V/I ratio was constant for a particular resistor. (Known as the Ohm's law)










Kirchhoff's Current Flow us the total amount of current into a  junction point of a circuit equals the total current that flows out of that same junction.
 
             I(1) + I(2) + I(3) = I(T) = I(4) + I(5)
    Kirchhoff's Voltage Law is the total of all electrical potential decreases in any complete loop is equal to any potential increases in that circuit loop.                                             
                                                             Gustav Robert Kirchhoff →↑



◎There is no net gain or loss of electric charge or energy in any circuit with the laws of conservation of electric charge and the conservation of energy, these laws are corresponding to the Kichhoff's laws too.


R = Resistance   V = Volts (The potential Difference)  I = Amperes (Current flow)
The equation of calculating electrical resistance is                        
R = V/I                                                            
               
The equation of calculating voltage (volt) is
                                                                                                    V = IR


The equation of calculating Current flow (Amperes) is
                             I = V/R

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