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Admin: Mid-term date set to Friday, March 20th. • Assignments: • • • • • Second graded assignment is posted Make time for it – it’s a bit tougher than the first one Due Monday March 2nd Use the hints. Don’t forget the other resources available to you – my office hours, my email, the discussion TAs and their office hours and emails. • My next office hours are tomorrow, 2pm – 3pm SHL 222 Copyright © 2009 Pearson Education, Inc. Today • Finishing up combination rules • Kirchoff’’s laws, part 1 Copyright © 2009 Pearson Education, Inc. Circuit analysis method 1: Apply element combination rules Series resistors Parallel resistors Series voltage sources Parallel current sources Copyright © 2009 Pearson Education, Inc. An example using the current divider rule Circuit analysis method 1: Example Copyright © 2009 Pearson Education, Inc. 1/REQ Does it make sense? I2 flows through lower resistance than I3, so I2>I3 Copyright © 2009 Pearson Education, Inc. Current divider rule !! 1/R Copyright © 2009 Pearson Education, Inc. Kirchhoff’s Rules Some circuits cannot be broken down into series and parallel connections. For these circuits we use Kirchhoff’s rules. 1824-1887 Copyright © 2009 Pearson Education, Inc. Kirchhoff’s Rules Junction rule (Kirchhoff’s current law): The sum of currents entering a junction equals the sum of the currents leaving it. Copyright © 2009 Pearson Education, Inc. Kirchhoff’s Rules Loop rule (Kirchhoff’s Voltage Law): The sum of the changes in potential around a closed loop is zero. Copyright © 2009 Pearson Education, Inc.