The SI unit of LCR refers to the SI units of **Inductance (L)**, **Capacitance (C)**, and **Resistance (R)**, which are the fundamental components in electrical circuits:
1. **Inductance (L):** The SI unit of inductance is the **henry (H)**. Inductance is a property of a conductor or a circuit that opposes the change in current passing through it. It is defined by the amount of voltage induced in a circuit due to a change in current over time.
- 1 Henry (H) = 1 volt-second per ampere (V·s/A).
2. **Capacitance (C):** The SI unit of capacitance is the **farad (F)**. Capacitance is a measure of a capacitor's ability to store an electric charge. A capacitor stores energy in an electric field, and capacitance is defined as the amount of charge stored per unit voltage.
- 1 Farad (F) = 1 coulomb per volt (C/V).
3. **Resistance (R):** The SI unit of resistance is the **ohm (Ω)**. Resistance is a measure of how much a material opposes the flow of electric current. It is defined by Ohm's Law, where the resistance is the ratio of voltage (V) across a component to the current (I) passing through it.
- 1 Ohm (Ω) = 1 volt per ampere (V/A).
### Summary
- **Inductance (L):** Henry (H)
- **Capacitance (C):** Farad (F)
- **Resistance (R):** Ohm (Ω)
These units are widely used in physics and electrical engineering to analyze and design electrical circuits, including filters, resonators, and oscillators, which are critical in various electronic applications.