Wednesday, September 15, 2010

Notes on Resistance, Ohm's law



Through the past two weeks of blogging, i found a major problem with this thing... I CAN'T UPLOAD ANY PICS~~~~! But just yesterday, i discovered from Young tat I've been writing in HTML mode. DD : Anyways, here's my notes, WITH SOME PICS.

1) Current  flow depends on 2 two major factors: the potential difference of the power supply and the nature of the pathway through the loads that are using the electric potential energy.
2)  Resistance is the hindrance to the flow of charge.
3)  We  can calculate resistance by using the following formula: R (Resistance) = V (Voltage) / I (Current)
4) Ohm's law is the ratio of  Voltage over Current. As we found out with our lab, as the current increase, so does potential difference. Vise versa, if the current decreases, so will the potential difference.
5) Factors that can determine the resistance of a conductor would be the likes of length, crossed-sectional area, material it is made of and its temperature.
6) The gauge # of a wire 
                                                      signals its crossed section area.
7) In a series circuit, the loads are connected one after another in a SINGLE path. In parallel circuits, they are side by side.
8) Kirchhoff's current law: the total amount of current into a junction point of a circuit equals the total current that flows out of the same junction. This law can be represented by the following equation: I1+I2+I3=IT=I4=I5
9) Kirchhoff's Voltage law: the total of all electrical potential decreases in any complete circuit loop is equal to any potential increases in that circuit loop. This law can be represented by the following equation: VT=V1+V2+V3
10) Laws of conservation of electric charge and the conservation of energy states that in any circuit, there is no net gain or loss of electrical charge or energy.

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