Determine the thévenin equivalent with respect to

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Fig. (22).
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25) Determine the Thévenin equivalent with respect to the terminals a,b for the circuit shown in Fig. (23). Fig. (23).
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26) When an ammeter is used to measure the current i Փ in the circuit shown in Fig. (24), it reads 6 A. a) What is the resistance of the ammeter?
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b) What is the percentage of error in the current measurement? 27) a) Find the Thévenin equivalent with respect to the terminals a, b for the circuit in Fig. (25) by finding the open-circuit voltage and the short-circuit current. b) Solve for the Thévenin resistance by removing the independent sources. Compare your result to the Thévenin resistance found in (a). Fig. (25) Fig. (24) 28) The variable resistor in the circuit in Fig. (26) is adjusted for maximum power transfer to. a) Find the value of R o . b) Find the maximum power that can be delivered to R o . c) Find a resistor in Appendix H closest to the value in part (a). How much power is delivered to this resistor? d) What percentage of the total power developed in the circuit in Fig. (26) that is delivered to R o when R o is set for maximum power transfer? Fig. (26)
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29) The variable resistor (R o ) in the circuit in Fig. (27) is adjusted until it absorbs maximum power from the circuit. a) Find the value of R o , b) Find the maximum power. c) Find the percentage of the total power developed in the circuit that is delivered to R o .
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30) a) In the circuit in Fig. (28), before the 5 mA current source is attached to the terminals a,b, the current i o is calculated and found to be 3.5 mA. Use superposition to find the value of i o after the current source is attached. b) Verify your solution by finding i o when all three sources are acting simultaneously. Fig. (28) Fig. (27)
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