Serway_PSE_quick_ch27

# Serway_PSE_quick_ch2 - Physics for Scientists and Engineers 6e Chapter 27 Current and Resistance Electric charge is conserved As a consequence when

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Physics for Scientists and Engineers, 6e Chapter 27 – Current and Resistance

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Electric charge is conserved. As a consequence, when current arrives at a junction of wires, the charges can take either of two paths out of the junction and the numerical sum of the currents in the two paths equals the current that entered the junction. Thus, current is 1 2 3 33% 33% 33% 1 2 3 4 5 1. a vector 2. a scalar 3. neither a vector nor a scalar
The currents in the two paths add numerically to equal the current coming into the junction, without regard for the directions of the two wires coming out of the junction. This is indicative of scalar addition. Even though we can assign a direction to a current, it is not a vector. This suggests a deeper meaning for vectors besides that of a quantity with magnitude and direction.

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Suppose that a current-carrying ohmic metal wire has a cross- sectional area that gradually becomes smaller from one end of the wire to the other. The current must have the same value in each section of the wire so that charge does not accumulate at any one point. How do the drift velocity and the resistance per
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## This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_PSE_quick_ch2 - Physics for Scientists and Engineers 6e Chapter 27 Current and Resistance Electric charge is conserved As a consequence when

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