निम्नलिखित में से कौन एक सक्रिय ट्रांसड्यूसर (active transducer) का प्रतिनिधित्व करता है?

On what fundamental basis does a mass spectrometer separate ions?

Which feature of a digital multimeter is used to automatically change its internal measurement range to detect the correct voltage, current, or resistance of a circuit?

Which device directly utilizes the Seebeck effect to convert a temperature difference into an electrical voltage signal?