5 Resistances

5 Resistances - ECE 110 M.-C. Brunet Ideal Sources Symbols...

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ECE 110 M.-C. Brunet Equivalent Resistances & Divider Rules Handout 5 Ideal Sources Symbols + v - i V s A Ideal Voltage “source” v = V AB = constant = V S or ny rrent + - B (for any current i !) These two ideal elements are not i Ideal Current “source” necessarily supplying energy! + v - i = constant = I S (for any voltage v !) I s i M.-C. BRUNET ECE 110 UIUC 5.1 This is NOT to be mistaken with an ammeter
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ECE 110 M.-C. Brunet Equivalent Resistances & Divider Rules Handout 5 eal ources eal struments Do not confuse the following symbols…. . Ideal Sources + + i Ideal Instruments i + V O L T v - V s - v - V m v A G E i i i C U I s I m v - + v - + R R E N T M.-C. BRUNET ECE 110 UIUC 5.2 v i Equivalent circuits A Use KVL, KCL !! B 20V 5V + - A B ? + - + - + - A B ? A B 13V 7V + - - + A 5A 8A A ? B B A 6A A A M.-C. BRUNET ECE 110 UIUC 5.3 B 16A 7A B ?
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ECE 110 M.-C. Brunet Equivalent Resistances & Divider Rules Handout 5 Tools to analyze circuits: -Kirchhoff’s laws (KVL, KCL) e previous lecture see previous lecture -Ohm’s law Ohm’s law : Applies through a resistor only ! +V AB - R = V AB I A B r AB I B r R Example 1 : Example 2 : +20v- -60v+ 5 k Ω 20 Ω i I i = I = M.-C. BRUNET ECE 110 UIUC 5.4 Let’s solve real circuits! Example 3 : A1 20V I 20 Ω + v1 - A -+ B V A = v1= I= A2 20V I 20 Ω + v - - + Im v= I= A3 20V I 20 Ω + v - Is M.-C. BRUNET ECE 110 UIUC 5.5 I= v=
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ECE 110 M.-C. Brunet Equivalent Resistances & Divider Rules Handout 5 Let’s solve real circuits! Example 3 (continued): B 20V I + - 1 Ω + V1 + V - - I= V1= V= C 15V i 1 + - 2k Ω 1k Ω i 2 + 0.5 - M.-C. BRUNET ECE 110 UIUC 5.6 i 1 = i 2 = Let’s solve real circuits!
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5 Resistances - ECE 110 M.-C. Brunet Ideal Sources Symbols...

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