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p2f10_lec03_circuits_and_amperes_law

# p2f10_lec03_circuits_and_amperes_law - Physics 1200 Lecture...

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P2F10 1 Physics 1200 Lecture 3a Circuits Concepts: Electromotive force and potential Series and parallel circuits Loop and junction rules RC time constant

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P2F10 2 Electromotive force emf is the "energy per unit electric charge" used to separate two opposite charges. It has the same units as electric potential. (volts) Sources of emf in circuits include batteries, capacitors, generators… pump High (+) reservoir Low (-) reservoir
P2F10 3 Kirchhoff’s Circuit Rules (the simple statement) 1-VOLTAGE RULE (LOOP RULE): The sum of changes in the potential ( V ) encountered in a complete traversal of any loop of a circuit must be zero. 2-CURRENT RULE (JUNCTION RULE): The sum of all currents into a point in a circuit is equal to the sum of all currents leaving that point.

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P2F10 4 EMF Loop Rule for Circuits The sum of changes in the potential ( V ) encountered in a complete traversal of any loop of a circuit must be zero. For a move through a resistor in the direction of the current, the change in V is - iR ; in the opposite direction it is + iR For a move through an emf from the negative terminal to the positive, the change in V is + E . E i R To solve for the current in a loop. Add up the EMF’s around the loop. 0 / E iR i E R - = =
iClicker question 3.1 Consider the circuit on your worksheets and on the demonstration board. P2F10 5 X Y Z 1 6 5 2 3 4 Which switch(es) must be closed in order to supply power only to light bulb X? A) 1 B) 1, 5, 6 C) 1, 2, 3, 5, 6 D) 1, 2, 4, 6

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P2F10 6 Resistors in Series 0 is the same for all 's. For each resistor: Loop rule: - so IN GENERAL - Series: j j T j j T j eq j eq j j i R V iR V V V i R iR R R = = = = =
P2F10 7 Resistors in Parallel 1 2 1 2 1 1 2 2 1 1 1 2 1 2 1 1 1 1 1 1 j T j T eq eq j eq j j eq j V V V V i i i i V V i R V i R i R V V V V i R R R R R R R R R R R = = = = + + = = = = = + + ÷ ÷ = + + ÷ ÷ = We use and and so so IN GENERAL: Parallel:

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iClicker Question 3.2a
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