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1
Announcements and Reminders
Exam 1 is today starting at 4:15 p.m.
Be sure to
arrive a few minutes early to find your room and
seat.
Homework 9 is due Friday.
Turn in a piece of paper with name and responses
if you don’t have your clicker with you today, or if
you haven’t given me your clicker ID yet
Kirchhoff’s Rules
• There are ways in which resistors can be
connected so that the circuits formed cannot
be reduced to a single equivalent resistor
• Two rules, called
Kirchhoff’s rules
, can be
used instead
Statement of Kirchhoff’s Rules
• Junction Rule
– The sum of the currents entering any junction
must equal the sum of the currents leaving that
junction
• A statement of Conservation of Charge
• Loop Rule
– The sum of the potential differences across all
the elements around any closed circuit loop
must be zero
• A statement of Conservation of Energy
Mathematical Statement of
Kirchhoff’s Rules
• Junction Rule:
Σ
I
in
=
Σ
I
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 Spring '09
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