notes3 2317

# notes3 2317 - ECE 2317 ECE Applied Electricity and...

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Prof. David R. Jackson ECE Dept. Spring 2011 Notes 3 ECE 2317 ECE 2317 Applied Electricity and Magnetism Applied Electricity and Magnetism Notes prepared by the EM Group University of Houston

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Current is the flow of charge: the unit is the Ampere (Amp) Current Current 1 Amp = 1 [C/s] Convention (Ben Franklin): positive current flows in the direction that positive charges move in. + + + + current flows from left to right. velocity Ampere
Current (cont.) Current (cont.) [ ] [ ] 7 2 2 10 N/m when 1 m x F d - = × = Definition of I = 1 Amp: I I d F x 2 x # 1 # 2 Two infinite wires carrying DC currents The Amp is actually defined first, and from this the coulomb is defined.

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Postulate: Positive charges moving one way is equivalent to negative charges moving the other way. Current (cont.) Current (cont.) 1 [A] - - - - flow rate is 1 C per second velocity equivalent to: + + + + flow rate is 1 C per second velocity
Sign convention: a positive current flowing one way is equivalent to a negative current flowing the other way. Current (cont.) Current (cont.) + + + + 1 [ A ] flow rate is 1 C per second velocity - 1 [ A ] or Note: The arrow is called the reference direction arrow.

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Mathematical definition of current Current (cont.) Current (cont.) reference direction arrow
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notes3 2317 - ECE 2317 ECE Applied Electricity and...

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