Welcome back everyone. Hope you had a nice holiday, enough to replenish your depleted physical and mental strength. This week, we’ll be covering Section VII: Gathering and Communicating Information, which is divided into 3 topics: Direct Sensing; Remote Sensing; and Communicating Information. Notes and tutorials would be provided, for A1 group, things will be very hectic from now on, as you guys have less than 4 months before the big A2 exams. A2, by no means you guys/gals are off the hook…
Here’s some preview:
Direct Sensing : understand that an electronic sensor consists of a sensing device and a circuit that provides an output voltage. In between, the processing unit will process the input picked up by the sensor, and sends this processed signal to an output device. LDR is usually built from CdS (cadmium sulphate) sandwiched between two metal electrodes. Then sketch the temperature characteristic of a negative temperature coefficient thermistor. Understand what does a transducer do and explain the way sound wave is transferred electrically via a microphone and speaker.
Posted by nazarin 