Electrical circuits lecture 2a

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Dr inż. Agnieszka Wardzińska Room: 105 Polanka agnieszka.wardzinska@put.poznan.pl cygnus.et.put.poznan.pl/~award Advisor hours: Tuesday: 10.00-10.45 Thursday: 10.30-11.15

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Voltage divider circuit

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Examples

V U and R R R R R if AB 5 1 5 4 3 2 1       

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Examples

V U and R R R R R if AB 5 1 5 4 3 2 1        1 1 R R R R R R U U_R _AB     

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Examples

V U and R R R R R if AB 5 1 5 4 3 2 1        V R R R R R R U U_R _AB 1 5 1 5 5 4 3 2 1 1 1  _ _ _ _  

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Examples

V U and R R R R R if AB 5 1 5 4 3 2 1       

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Examples

V U and R R R R R if AB 5 1 5 4 3 2 1            R R 2 R

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Examples

        2 2 3 2 23 R R R R R R V U and R R R R R if AB 5 1 5 4 3 2 1       

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Examples

             1 // 2 2 45 23 45 23 5 4 45 3 2 23 R R R R R R R R R R R R V U and R R R R R if AB 5 1 5 4 3 2 1       

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Examples

1 1 45 22 45 23 45 23 5 4 45 3 2 23 // 1 // 2 2 R R R R U U R R R R R R R R R R R R AB R  _              V U and R R R R R if AB 5 1 5 4 3 2 1       

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Examples

V U and R R R R R if AB 5 1 5 4 3 2 1        V R R R R U U R R R R R R R R R R R R AB R 2.5 2 1 5 // 1 // 2 2 1 1 45 22 45 23 45 23 5 4 45 3 2 23                 

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Current divider circuit

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Voltage and Current source

equivalence

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Voltage and Current source

equivalence

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Voltage and Current source equivalence

J

I



_Z



Note Z

I



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Voltage and Current source equivalence

J

I



_Z



Z

U

E

U





Note Z

I



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Maximum Power Transfer Theorem for

DC

 Maximum Power Transfer Theorem states that the maximum amount of power will be dissipated by a load if its total resistance Rl is equal to the

source total resistance Rs of the

network supplying power.

 For maximum power:

 The Maximum Power Transfer

Theorem does not assume maximum or even high efficiency, what is more important for AC power distribution.

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