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The circuit above shows a single potential difference connected to five resistors of various values and two capacitors of identical value. Three ammeters, ${ A }_{ 1 }$, ${ A }_{ 2 }$ and ${ A }_{ 3 }$, are connected in series in various parts of the circuit.

If the current in ${ A }_{ 2 }$ reads $4.2\text{ amps}$, and the current in ${ A }_{ 3 }$ reads $1.9\text{ amps}$, what is the current in ${ A }_{ 1 }$?


$1.9\text{ amps}$


$2.3\text{ amps}$


$6.1 \text{ amps}$


The current in ${A}_{1}$ cannot be determined without how long the circuit has been connected..

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