| Feature | Active Transducers | Passive Transducers |
|---|---|---|
| Power Supply | Requires an external power source to operate | Does not require an external power source |
| Energy Conversion | Converts physical quantities directly into electrical signals | Converts physical quantities into a change in non-electrical form (e.g., resistance) |
| Output Signal | Direct electrical signal (voltage or current) | Change in resistance, capacitance, or inductance (needs external circuit to measure) |
| Signal Processing | Signal can be read directly, no need for complex circuitry | Requires external circuits (e.g., bridge circuits) to process the signal |
| Examples | Thermocouples, Piezoelectric sensors, Photovoltaic cells | Strain gauges, Thermistors, LVDTs |
