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Presented by:
Mahmudul Hasan Himel
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Thevenin Theorem
„H Any two DC network can be replaced by the equivalent circuit of a DC voltage source of a series resistance.
Thevenin Equivalent Circuit
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Example
„H Find the thevinin equivalent circuit between a and b.
Step- 1: Shortening voltage sources and removing the position of the network where the Thevenin equivalent circuit has be found.
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Step 2: View back into the open circuited network i. e. from the open terminal A and B. Calculate equivalent resistance of the circuit, i. e. R Th .
Now calculate the internal resistance of the network.
We get the value of R Th = 5ohm. Of the Thevenin’s equivalent circuit .
Step 3 : Draw the circuit as previous but keeping the Load Resistance removed from A and B terminal .
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Step 4 : Find the individual Loops. Apply KVL ( Kirchhoff’s Voltage Law) and find out loop current.
for loop 1:
for loop 2:
By solving two equations we get the value of I 1 = 1.041 A and I 2 = 1.25 A .
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„H Step 5: Start journey from terminal A to B by choosing any path of branches. Calculate total Voltage that you have faced during journey. This voltage is V Th .
Now by applying KVL again, we can write that,
Thevenin’s Voltage V Th is 17.5V.
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Thank You
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