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Draw a schematic diagram of a circuit consisting of a battery of three cells of \(2\ V\) each, a \(5\ Ω\) resistor, an \(8\ Ω\) resistor, and a \(12\ Ω\) resistor, and a plug key, all connected in series.
 
A circuit consisting of a battery of three \(2\ V\) cells is equal to a potential of .