internal resistance

noun Electricity.
the resistance within a battery, or other voltage source, that causes a drop in the source voltage when there is a current. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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 10th Edition
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Example sentences
That, in turn, decreases the battery's internal resistance and improves its
  ability to store and deliver energy.
Apart from internal resistance, reformers face two further obstacles.
Internal resistance and inductance limit the rate that energy can be released.
For internal resistance to become apparent, the battery must be connected to an
  external resistance to cause a current to flow.
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