A noninverting summer interface device is shown in Figure \(\mathrm{P}_{3}=\) 82. Of importance is that the input to the device has infinite resistance-that is, no current flows into the device. The output voltage for this configuration is two times the input voltage. Develop a relationship for the voltage \(v_{\mathrm{L}}\) across \(R_{\mathrm{L}}\) with respect to the two input voltages and the two input resistances.