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s07_concept

# s07_concept - to zero and determine the resistance looking...

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Thevenin Equivalent Circuit Concept Test + For the circuit above, the Thevenin equivalent circuit has 1. V T = 10 V , R T = 10 Ω 2. V T = 10 V , R T = 20 Ω 3. V T = 10 V , R T = 5 Ω 4. V T = 5 V , R T = 10 Ω 5. V T = 5 V , R T = 20 Ω 6. V T = 5 V , R T = 5 Ω

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Thevenin Equivalent Circuit Solution 0 5 10 15 1 2 3 4 5 6 Number of Students Answer Lecture S7: Thevenin Equivalent 0 5 10 15 20 25 30 1 2 3 4 5 6 Number of Students Answer Lecture S7: Thevenin Equivalent (repeat) The open circuit voltage is given by 10 Ω V oc = 10 V = 5 V 5 Ω + 10 Ω + 5 Ω since the circuit is basically a voltage divider, with three resistors. Therefore, V T = V oc = 5 V
To find the Thevenin equivalent resistance, set all the sources to
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Unformatted text preview: to zero, and determine the resistance looking into the terminals. A voltage source of zero strength is a short circuit, so the result is that the two 5 Ω resistors are in series, forming an equivalent 10 Ω . This is in turn in parallel with the 10 Ω resistor. The equivalent resistance of two 10 Ω resistors in parallel is 5 Ω . Thus, R T = 5 Ω The correct answer is therefore number 6. The class did much better on the second try....
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