Question

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

• A. $2.5\Omega ,4A,10V$
• B. $2.5\Omega ,4A,10V$
• C. Open, 4 A, 0 V
• D. Short, $\infty A$, 10 V

Answer 1

The correct option is A $2.5\Omega ,4A,10V$

Maximum power transfer of VI product is maximum if we draw the curve, it intersect (10.4) that will give maximum power.
The terminal voltage is 10 V(Load voltage) and current is 4 A(Load current).



$Loadresistanceis\frac{10}{4}=2.5\Omega$