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A benchtop DC power supply acts as an ideal 4 A current source as long as its terminal voltage is below 10 V. Beyond this point, it begins to behave as an ideal 10 V voltage source for all load currents going down to 0A. When connected to an ideal rheostat, find the load resistance value at which maximum power is transferred, and the corresponding load voltage and current.
2.5 Ω, 4 A, 10V
2.5 Ω, 4 A, 5V
Open, 4 A, 0 V
Short, ∞A, 10V

Maximum power transistor of VI product is maximum. If draw the curve, it intersect (10,4) that will give maximum power.
The terminal voltage is 10 V (Load voltage) and current is 4A (Load current).
Load resistance = 