Based on the part number **LOR3-R0075-H**, this is a specialized electronic component typically identified as a **Current Sense Resistor**. It is designed to measure current flow by creating a very small, predictable voltage drop across its terminals. --- ### 1. Part Number Breakdown While specific manufacturers (such as LIZ Electronics) use variations of this code, the nomenclature generally breaks down as follows: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **LOR** | Series Type | Low Ohmic Resistor / Metal Strip Series | | **3** | Power Rating | Typically represents 3 Watts | | **R0075** | Resistance Value | 0.0075 Ohms (or 7.5 mΩ) | | **H** | Tolerance / Features | Often denotes ±3% or High-reliability/Halogen-free | --- ### 2. Key Technical Specifications Components of this nature usually share these fundamental characteristics: * **Type:** Shunt / Metal Plate Current Sense Resistor. * **Resistance:** 7.5 milliohms (mΩ). * **Power Dissipation:** 3.0 Watts at rated temperature. * **Material:** Often constructed from a manganese-copper alloy or similar metal strip for thermal stability. * **Mounting Type:** Surface Mount (SMD) – size is often correlated to the power rating (e.g., 2512 or larger). --- ### 3. Applications and Usage The **LOR3-R0075-H** is used in circuits where monitoring high current is critical without causing significant power loss. * **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in Li-ion packs. * **DC-DC Converters:** Providing feedback for current-mode control loops. * **Motor Controllers:** Detecting over-current conditions to protect the motor and driver. * **Power Supplies:** Load sensing and regulation. --- ### 4. Implementation Example In a standard sensing circuit, the resistor is placed in series with the load. The voltage ($V$) measured across the resistor is used to calculate current ($I$) via Ohm's Law: ```python # Simple Python calculation for Current Sensing resistance = 0.0075 # Ohms (7.5mR) voltage_drop = 0.015 # Measured Volts (15mV) # Calculate Current: I = V / R current = voltage_drop / resistance print(f"Measured Current: {current} Amperes") # Output: Measured Current: 2.0 Amperes ``` ---