Capacitive Reactance: AC can pass through a capacitor, but capacitors still offer resistance to AC. This resistance is known as capacitive reactance. A larger capacitance allows AC to pass more easily, indicating that the capacitor's resistance is lower; similarly, a higher frequency of AC also passes more easily, suggesting that the capacitive reactance decreases with frequency. Experiments show that capacitive reactance is inversely proportional to capacitance and frequency. If capacitive reactance is denoted as XC, capacitance as C, and frequency as f, then the unit of capacitive reactance is ohms. Knowing the frequency f and capacitance C of the AC, capacitive reactance can be calculated using the above formula. Inductive Reactance: Inductive reactance is a physical quantity that measures the ability of a coil to produce electromagnetic induction. When current flows through a coil, a magnetic field is generated around it, and the coil has magnetic flux passing through it. The greater the power supply to the coil, the stronger the magnetic field, and the greater the magnetic flux passing through the coil. Experiments show that the magnetic flux through the coil is directly proportional to the current flowing through it, and this ratio is called the self-inductance coefficient, or inductance. If the magnetic flux through the coil is denoted as φ, the current as I, and the inductance as L, then the unit of inductance is henry (H), often also expressed in millihenries (mH) or microhenries (uH). 1H = 1000mH, 1H = 1,000,000uH. Inductive Reactance: AC can also pass through a coil, but the inductance of the coil offers resistance to AC, which is called inductive reactance. A larger inductance makes it more difficult for AC to pass through the coil, indicating that the inductive reactance is higher; similarly, a higher frequency of AC also makes it more difficult to pass through the coil, suggesting that the inductive reactance increases with frequency. Experiments show that inductive reactance is directly proportional to inductance and frequency. If inductive reactance is denoted as XL, inductance as L, and frequency as f, then the unit of inductive reactance is ohms. Knowing the frequency f and inductance L of the AC, inductive reactance can be calculated using the above formula. Impedance: In a circuit with resistance, inductance, and capacitance, the resistance to AC is called impedance. Impedance is commonly denoted as Z. Impedance is composed of resistance, inductive reactance, and capacitive reactance, but not simply added together. If they are in series, and the frequency f, resistance R, inductance L, and capacitance C of the AC are known, then the impedance of the series circuit is calculated as follows. The unit of impedance is ohms. For a specific circuit, impedance is not constant but varies with frequency. In a series circuit with resistance, inductance, and capacitance, the circuit's impedance is generally greater than resistance. That is, the impedance is reduced to its minimum value. In a parallel circuit with inductance and capacitance, the impedance increases to a value during resonance, which is the opposite of the series circuit.

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