Draw a schematic diagram of a circuit consisting of a battery of three cells of $2\, V$ each,a $5 \,\Omega $ resistor,an $8\,\Omega $ resistor,and a $12\,\Omega $ resistor,and a plug key,all connected in series.

(N/A) Three cells of potential $2\, V$ each,connected in series,are equivalent to a battery of potential $2\, V + 2\, V + 2\, V = 6\, V$.
The following circuit diagram shows three resistors of resistances $5 \,\Omega$,$8 \,\Omega$,and $12 \,\Omega$ respectively,connected in series with a battery of potential $6\, V$ and a closed plug key.