What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 1,800 ohms and RF is 68 kilohms?

For the inverting operational amplifier shown in Figure E7-3, the absolute voltage gain is calculated simply by dividing the feedback resistor (RF) by the input resistor (R1). The term 'absolute' means you can ignore the negative sign that indicates phase inversion. Before calculating, ensure both values use the same units. RF is given as 68 kilohms, which is 68,000 ohms. R1 is given as 1,800 ohms. Divide 68,000 by 1,800 to get approximately 37.77. Rounding this to the nearest whole number gives an absolute gain of 38.