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ECE201_02_V_sources_Pwr_before

# ECE201_02_V_sources_Pwr_before - ECE 201 Lecture 2...

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1 ECE 201, Lecture 2 The first homework is due now Late first homework due at the beginning of lecture Friday (half credit maximum) 4 lowest scores in homework can be dropped. Office hours: Monday, 1:30pm-2:30pm and Friday 2:30pm – 4:30pm. Announcements

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2 Complications in Currents There are positive and negative charges Current direction is along the flow direction of positive charges Positive charges moving along one direction = negative charges moving to the opposite direction Currents can be either positive or negative + or – sign, magnitude and reference direction, collectively, define a real current. 1 A - 1 A
3 Relationship between Charge and Current In a time interval t, a total or net charge of q flow by a given point, then Current in terms of charge Charge in terms of current If t1=0 and write t for t2, then If t1 is -  and q(- ) = 0, then Q (or q) in C and I (or i) in A dt ) t ( dq t q ) t ( i = = - 2 1 t t 1 2 dt ) t ( i ) t ( q ) t ( q - = t dt ) t ( i ) t ( q 0 ( ) (0) ( ) t q t q i t dt = +

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4 - - - < = s 12 t , 0 s 12 t s 10 , C ) 12 t ( 2 s 10 t s 8 , C 4 s 8 t s 4 , C ) t 6 ( 2 s 4 t s 2 , C 4 s 2 t 0 , C t 2 0 t , 0 ) t ( q - < = s 12 t , 0 s 12 t s 10 , A 2 s 10 t s 8 , 0 s 8 t s 4 , A 2 s 4 t s 2 , 0 s 2 t 0 , A 2 0 t , 0 ) t ( i Example 1. Given q(t), find i(t).
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ECE201_02_V_sources_Pwr_before - ECE 201 Lecture 2...

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