a) Assume the 20 V source in the circuit in Fig. P4.49 is changed to 60 V. Find the total power dissipated in the circuit.
Ă‚Â b) Repeat (a) with the 6 A current source replaced by a short circuit.
Ă‚Â c) Explain why the answers to (a) and (b) are the same.
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Ă‚Â d) Now assume you wish to change the value of the 90 V source, instead of the 20 V source, in the circuit in Fig. P4.49 to get the same power dissipated by the current source that you found in (a) and (b). Use the results in part (c) to calculate the new value of this voltage source.