See diagram in attache file.
The figure to the left is a voltage source, which has a internal resistance Ri.
The figure to the right is a resistor ( R ) (outside the source)
1. What is the maximumpower that can be delivered to the load R?
2. What value of R achieves that?

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Calculate the required value of source resistance of the supply to give maximumpowertransfer.

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Can someone please tell me how I would calculate the maximumpowerand efficiency for this data set? I'm not sure if P=IV is appropriate and if it is I don't know how I would get Pmax.
** Please see the attached Excel file for the complete problem **