*Question E7G07:
What voltage gain can be expected from the circuit in Figure E7-3 when R1 is 10 ohms and RF is 470 ohms?*  

*Correct Answer is  C: 47*  

### AI Response: (may contain errors)  

To determine the voltage gain of the circuit in Figure E7-3, we need to understand that this is a typical inverting amplifier configuration using an operational amplifier (op-amp). The voltage gain ($A_v$) for an inverting op-amp is given by the formula:

$$
A_v = -\frac{R_F}{R_1}
$$

where:
- $R_F$ is the feedback resistor,
- $R_1$ is the input resistor.

Given:
- $R_1 = 10 \, \text{ohms}$
- $R_F = 470 \, \text{ohms}$

Substitute these values into the formula:

$$
A_v = -\frac{470}{10} = -47
$$

The negative sign indicates that the output is inverted, but the magnitude of the gain is 47.

### Explanation of Choices:
- **A: 0.21**  
  This choice is incorrect because it suggests a much lower gain than calculated. It might result from a misunderstanding of the formula or incorrect values.

- **B: 4700**  
  This choice is incorrect because it suggests a much higher gain. It could result from mistakenly multiplying the resistors instead of dividing.

- **C: 47**  
  This is the correct answer. The calculated gain magnitude is 47, which matches this choice.

- **D: 24**  
  This choice is incorrect because it does not match the calculated gain. It might be a result of a calculation error or misinterpretation of the resistor values.

### Key Points:
- The formula for the voltage gain of an inverting op-amp is crucial.
- Ensure correct substitution of resistor values into the formula.
- The negative sign in the gain formula indicates phase inversion, but the exam question focuses on the magnitude.