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ECE201_01_elemts_chgs_currts

# ECE201_01_elemts_chgs_currts - ECE 201 Fall 2011 Instructor...

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1 Instructor: Minghao Qi (pronounced as “Minhao Chee”) Office: EE 330 & BRK 1297 Tel: 494-3646 E-mail: [email protected] 1995 BS, University of Science and Technology of China 1998 MS, 2005 PhD, MIT Assistant Professor of Electrical and Computer Engineering, 2005 – 2011 Associate Professor of Electrical and Computer Engineering, 2011 – present Blackboard Vista will be setup ECE 201 Fall 2011

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2 Electrical Charges Charge Charge of an electron: - e = - 1.601 × 10 - 19 C Charge of a proton: e = +1.601 × 10 -19 C ± 1 C (coulomb) is the total charge of 6.25 × 10 18 protons or electrons. VERY BIG NUMBER! (Human being ~6 × 10 9 ) Use prefixes 10 - 3 , milli, m 10 +3 , kilo, k 10 - 6 , micro, μ , 10 +6 , mega, M 10 - 9 , nano, n, 10 +9 , giga, G e = 0.1601 aC (atto coulomb) See Table 1.1 in p. 25 for a complete set of prefixes.
3 Current Rate of flow of charges through a fictitious boundary Magnitude 1 ampere = 1 coulomb per second 1 A = 1 C/s Direction: Use an arrow to indicate the reference direction 1 A - 1 A Current

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4 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 t 1 =0 and write t for t 2 , then If t 1 is - and q(- ) = 0, then Q (or q) in C and I (or i) in A = - 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 = + ( ) ( ) q dq t i t t dt =
Example 1: Given q ( t ), find i ( t ) 5 q ( t ), C i ( t ), A t , sec. t , sec. 2 2 4 2 1 4 6 8 10 12 2 4 6 8 10 12 -4 -2 -2 -1

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Example 2: given i ( t ), find q ( t ) 6 q ( t ), C i ( t ), A t , sec. t , sec. 2 2 4 2 1 4 6 8 10 12 2 4 6 8 10 12 -4 -2 -2 -1 1 1

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Office Hours Location: EE 26 Monday 1:30-2:30pm (1 hour session) Friday 2:30-4:30pm (2 hour session) Prof. Jason Clark: MWF 8:30am-9:30am Prof. Evgenii Narimanov: MW 2:30pm-4pm (1.5 hour session) 8
9 Your Resources 201 Help Room: EE 26 A TA or Instructor will be available to answer questions: During business hours (8am-5pm) Monday through Friday. Please check the schedule outside EE26 and webpage. Feel free to ask questions to any TA there, not only the one for our section. Blackboard Vista Please take advantages of the resources! TAs: Ming Chen, [email protected] Christina Lentz, [email protected] Tanmay Prakash, [email protected] Swagath Venkatramani, [email protected] Minh Nguyen, [email protected]

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10 Grading Your ranking within the section you are registered in, based on the following: 3 tests 80, 100 and 120 pts each Final 200 pts HW 100 pts Quizzes 100 pts Unannounced in-class quizzes help check instant understanding and class attendance Total 700 pts Grading policies will be strictly followed, with the exception in the next slide.
11 Exception I reserve the right to bump up a student's term grade if he/she did exceptionally well in the final exam.

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