电路考研真题英语部分如下：
Question 1:
The output voltage of the op-amp circuit is given by:
V_out = A * (V_in - V_f)
Where A is the gain of the amplifier, V_in is the input voltage, and V_f is the feedback voltage. Determine the gain of the circuit if the input voltage is 5V and the output voltage is 15V, and the feedback voltage is 10V.
Answer 1:
Using the given formula, we can solve for the gain A as follows:
A = V_out / (V_in - V_f)
A = 15V / (5V - 10V)
A = 15V / (-5V)
A = -3
Therefore, the gain of the circuit is -3.
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