Question

An energy source will supply a constant current into the load if its internal resistance is

• A. zero
• B. nonzero but less than the resistance of the load
• C. equal to the resistance of the load
• D. very large as compared to the load resistance.

Answer 1

The correct option is A zero

Energy source will supply a constant current into the load if its internal resistance is zero.

Since, current, $I$ is given by

$I=\frac{E}{R+r}$

For constant current to the load,

$I=\frac{E}{R}=\text{constant}$

This is possible only if internal resistance, $r=0$