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=====Gain using alternative output variables=====
In the amplifier of Figure 6, ''R''<sub>L</sub> and ''R''<sub>C2</sub> are in parallel.
To obtain the transresistance gain, say ''A''<sub>ρ</sub>, that is, the gain using voltage as output variable, the short-circuit current gain ''G'' is multiplied by ''R<sub>C2</sub> // R<sub>L</sub>'' in accordance with [[Ohm's law]]:

::<math> A_{ \rho} = G \left( R_\mathrm{C2} // R_\mathrm{L} \right) \ . </math>

The ''open-circuit'' voltage gain is found from ''A''<sub>ρ</sub> by setting ''R''<sub>L</sub> → ∞.

To obtain the current gain when load current ''i<sub>L</sub>'' in load resistor ''R''<sub>L</sub> is the output variable, say ''A''<sub>i</sub>, the formula for [[current division]] is used: ''i<sub>L</sub> = i<sub>out</sub> × R<sub>C2</sub> / ( R<sub>C2</sub> + R<sub>L</sub> )'' and the short-circuit current gain ''G'' is multiplied by this [[Voltage divider#Loading effect|loading factor]]:

::<math> A_i = G \left( \frac {R_{C2}} {R_{C2}+ R_{L}} \right) \ . </math>

Of course, the short-circuit current gain is recovered by setting ''R''<sub>L</sub> = 0 Ω.