Chapter 26 Current and Resistance

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Presentation transcript:

Chapter 26 Current and Resistance In this chapter we will introduce the following new concepts: -Electric current ( symbol i ) -Electric current density vector (symbol ) -Drift speed (symbol vd ) -Resistance (symbol R ) and resistivity (symbol ρ ) of a conductor -Ohmic and non-Ohmic conductors We will also cover the following topics: -Ohm’s law -Power in electric circuits (26 - 1)

A B (26 - 2)

(26 - 3) i + q conductor i - q conductor

i + q conductor A i - q conductor A (26 - 4)

(26 - 5)

+ - i V R (26 - 6)

+ - i V (26 -7)

(26 -8)

(26 - 9)

(26 - 10)

(26 - 11)

(26 - 12)

V (26 - 13)