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PHY122_L06

# PHY122_L06 - PHY122 Physics for the Life Sciences II PHY122...

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PHY122 PHY122 – Physics for the Life Sciences Physics for the Life Sciences II II PHY122 Physics for the Life Sciences Lecture 6 Currents and Resistance Note: Clicker Channel 21 Lecture 6 1 09/15/2011

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Currents and Current Conservation W fl ( ) n Water flow (water current): goes from high to low; from places with high gravitational potential to places with lower potential it can be “pumped up” by other sources of energy in water pumps … its potential energy can be stored in a reservoir behind a dam when ever it gets to a junction, the total amount of flow (water mass/second) is conserved the amount of flow (mass/second) into a junction equals the out flow Q All this translates to charge flow = electrical current current flows from high electrical potential to lower potential it b d ” i id b tt t I t it can be “ pumped up ” inside a battery or generator … it can be stored in a capacitor when it gets to an electrical junction , the total flow is conserved : the current that goes in = the current that comes out With convention in-going current is positive, outgoing is negative: 09/15/2011 Lecture 6 2 0 i i I Kirchhoff’s junction law