what is internal resistance of a cell?
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Batteries and cells have an internal resistance (r) which is measures in ohm's (W). When electricity flows round a circuit the internal resistance of the cell itself resists the flow of current and so thermal (heat) energy is wasted in the cell itself.
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Internal resistance usually means the electrical resistance inside batteries and power supplies that can limit the potential difference that can be supplied to an external load.OTOH, the same battery with an external load of resistance 1000 Ohms will deliver almost all of the 1.60 volts to the load.
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