the resistance within a battery, or other voltage source, that causes a drop in the source voltage when there is a current.
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How to use internal resistance in a sentence
When you feel internal resistance to what is happening around you, instead of shutting down, use that as a cue to engage.
This cell will have a voltage of two volts, a rather low internal resistance, and will be capable of delivering a large current.The Boy Mechanic, Book 2 | Various
If cells are joined together their combined internal resistance depends upon the method of grouping the cells.Physics | Willis Eugene Tower
The several plates of a cell being in parallel and close together, the cell has but small internal resistance.Physics | Willis Eugene Tower
A man can work—good straightforward work, without internal resistance, until he drops,—and never hurt himself.The Secret Places of the Heart | H. G. Wells
With current flowing through the cell, however, the increased internal resistance causes a marked drop in the voltage.The Automobile Storage Battery | O. A. Witte
British Dictionary definitions for internal resistance
physics the resistance of a cell, accumulator, etc, usually given as (E - V)/ I, where E is the emf of the cell, and V the potential difference between terminals when it is delivering a current I
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012