Chapter 16 - different RESISTIVITY ( ) Ω∙m = R1R2 ρ1...

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CHAPTER 16 16.3 Potential difference between any two points can be measured using a voltmeter – must be connected in parallel with a load in the circuit Electrical energy always originates from some other form of energy – it is a kind of medium of exchange for obtaining energy easily produced forms to forms we need Examples: Voltaic cells, Piezo-electricity, thermoelectricity, photo-electricity, electromagnetic induction in generators 16.5 Resistance – the measure of this opposition to flow The amount of current flowing through a resistor varies directly as the amount of potential difference applied across the resistor as long as the other variables, such as temperature are controlled. There is a resistance of 1Ω when 1 A of current flows with a potential difference of 1 V across a resistor FACTORS THAT DETERMINE RESISTANCE Length Longer conductor=more resistance = R1R2 L1 L2 Cross- sectional area (CSA) Larger CSA or thickness of conductor=less resistant = R1R2 A2 A1 Material Type Different conductors have
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Unformatted text preview: different RESISTIVITY ( ) Ω∙m = R1R2 ρ1 ρ2 Temperatur e Higher temperature=higher molecular motion=more resistance 16.6 Series circuit – the loads are connected one after another in a single path Parallel circuit – the loads are connected side by side 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 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 Law of Conservation of Electric Charge – electricity can be transferred from one source to another, it cannot be destroyed or created and the total electric charge remains the same in a closed system SERIES = + + VTotal V1 V2 V3 = = = IT I1 I2 I3 = + + RT R1 R2 R3 = ( ) RT N R PARALLEL = = = VT V1 V2 V3 = + + IT I1 I2 I3 = + + 1RT 1R1 1R2 1R3 = P IV = P V2R = P I2R...
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This note was uploaded on 05/29/2010 for the course SCI 5421 taught by Professor Russel during the Spring '10 term at Morton College.

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Chapter 16 - different RESISTIVITY ( ) Ω∙m = R1R2 ρ1...

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