# E7G11 - What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3,300 ohms and RF is 47 kilohms?

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**Category:** Extra Questions\
**Created:** [January 2, 2026, 7:53pm UTC](https://forum.openhamprep.com/t/e7g11-what-absolute-voltage-gain-can-be-expected-from-the-circuit-in-figure-e7-3-when-r1-is-3-300-ohms-and-rf-is-47-kilohms/1421 "2026-01-02T19:53:27Z")\
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**Author:** ![system](https://forum.openhamprep.com/uploads/default/original/1X/a8bc13ef992b522befd6b1d923d2f2a53605a9c7.png) [@system](https://forum.openhamprep.com/u/system)\
**Post date:** [January 2, 2026, 7:53pm UTC](https://forum.openhamprep.com/t/e7g11-what-absolute-voltage-gain-can-be-expected-from-the-circuit-in-figure-e7-3-when-r1-is-3-300-ohms-and-rf-is-47-kilohms/1421/1 "2026-01-02T19:53:27Z")

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## Question

What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3,300 ohms and RF is 47 kilohms?

 ![E7-3](https://forum.openhamprep.com/uploads/default/original/1X/3ee24bb7bfac94f54f6c532b9c61fcad35845035.png)

## Answer Options

- **A)** 28
- **B)** 14
- **C)** 7
- **D)** 0.07

**Correct Answer: B**

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## Explanation

The voltage gain of the inverting op-amp circuit in Figure E7-3 is calculated by taking the ratio of the feedback resistor (R\_F) to the input resistor (R\_1). This ratio sets the magnitude of the amplification that the circuit provides to the input signal.

R\_1 = 3,300 \Omega and R\_F = 47 \text{ k}\Omega = 47,000 \Omega. The absolute voltage gain is |A\_V| = R\_F / R\_1 = 47,000 \Omega / 3,300 \Omega \approx \mathbf{14.24}. Rounding to the nearest integer, the expected absolute gain is **14**. The circuit amplifies the input voltage by a factor of 14 and inverts the phase.

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