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\subsection{Current Measurement}  Electrical current is the rate of flow of electrons. In Direct Current (DC) applications such as electroforming, this flow is one-way and directly relates to the flow of ions through the electrolysis medium. Measuring current is therefore key to calculating the mass transfer during the electroforming process.  The most basic form of current measurement can be undertaken using a sub-ohm resistor of known value. The resistor is placed in series with the circuit under test, and the voltage drop across it is measured using one of the techniques discussed in \ref{volt-meas}. The current through the resistor, and therefore the circuit under test (see Kirchoff's Current Law \cite{}), can be calculated using Ohm's Law \cite{}. \cite{} $V = I \times R.  \subsection{Current Control}