186. In the circuit below, if the variable resistance increases from zero to $18\,\Omega$, the terminal voltage of the battery changes from how many volts to how many volts? [Figure: Circuit with variable resistor $R$, fixed resistor $6\,\Omega$, battery with internal resistance $r = 1.5\,\Omega$ and $\varepsilon = 12\,\text{V}$]
[(1)] 12 to 6
[(2)] 12 to 9
[(3)] zero to 6
[(4)] zero to 9
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\textbf{186.} In the circuit below, if the variable resistance increases from zero to $18\,\Omega$, the terminal voltage of the battery changes from how many volts to how many volts?
\textit{[Figure: Circuit with variable resistor $R$, fixed resistor $6\,\Omega$, battery with internal resistance $r = 1.5\,\Omega$ and $\varepsilon = 12\,\text{V}$]}
\begin{itemize}
\item[(1)] 12 to 6
\item[(2)] 12 to 9
\item[(3)] zero to 6
\item[(4)] zero to 9
\end{itemize}
\noindent\rule{\textwidth}{0.4pt}
\textbf{Workspace for Calculations}
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