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

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Prof. Filippo Capolino ECE Dept. Fall 2006 Notes 3 ECE 2317 ECE 2317 Applied Electricity and Magnetism Applied Electricity and Magnetism Notes prepared by the EM group, University of Houston . (used by Dr. Jackson, spring 2006) 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 Sign convention #1: 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. Sign convention #2: 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 - 1 [ A ] equivalent to: + + + + flow rate is 1 C per second velocity or
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