在电路英语考研的真题中，考生往往需要面对一系列关于电路原理、电子元件以及模拟与数字电路设计的问题。以下是一些典型的电路英语考研真题及答案示例：
1. 真题：What is the primary function of a resistor in an electrical circuit?
答案：The primary function of a resistor in an electrical circuit is to limit the flow of electric current, thereby controlling the power dissipation and voltage across the circuit.
2. 真题：Explain the difference between an analog and a digital signal.
答案：An analog signal is a continuous signal that varies smoothly over time, while a digital signal is discrete, consisting of a series of binary values (usually 0s and 1s) that represent information.
3. 真题：What is the purpose of a diode in a circuit?
答案：A diode is used in a circuit to allow current to flow in only one direction, acting as a one-way valve for electric current.
4. 真题: Describe the concept of impedance in an AC circuit.
答案：Impedance in an AC circuit is the measure of the opposition to the flow of alternating current. It includes both resistance and reactance, and is represented by the symbol Z.
5. 真题: How does a transformer work?
答案：A transformer works on the principle of electromagnetic induction. It consists of two coils of wire, the primary and the secondary, wound around a common iron core. When an alternating current passes through the primary coil, it creates a changing magnetic field, which in turn induces a voltage in the secondary coil.
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