What does internal resistance of a battery mean?

Answer:

Specific (chemical) systems can more easily flow energy compared to other systems. Both voltage (V) and internal resistance (ohms) are important for a batteries performance. You can compare the internal resistance of a battery with a tap where water flows through. If the internal resistance is low, there will flow a lot of water through the tap. If the internal resistance is high, this will work the other way around. This is also comparable with the difference between a big and a small tab. Battery types with a low internal resistance are respectively nickel-cadmium, nickel-hydride, alkaline, photo lithium and mercury oxide. Battery types with a high internal resistance are respectively lithium, zinc air, silver oxide and zinc carbon.

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