Question

If large current is drawn from the cell, i.e., external resistance is low, then drop in potential across the terminals of cell is:

Options

• very small

• very large

• does not change

• none of these

Answer 1

Very large

Explanation:

When the external resistance is low, the current is large. The internal voltage drop is $$Ir$$, so it becomes very large. The terminal voltage, $$V_{\text{terminal}} = E - Ir$$, therefore becomes small and does not remain constant.