I have two urgent questions. SAC is on Monday... Please help. Will be forever grateful.
1. In the study design, in the photonics and electronics section, they say we need to calculate the effective resistance for circuits comprising of unloaded voltage dividers. What's an unloaded voltage divider?
2. The study design says we need to know stuff re:"energy transfers and transformations in opto-electric devices". Is that that stuff about how electrical energy is transferred to thermal/light/whatever energy?
1) A loaded voltage divider is where the resistance of a load in parallel is far too great for it to impact the effective resistance, so I'm going to assume that unloaded is an object that is attached in parallel where the resistance is not too high so that it actually impacts the total effective resistance in that parallel section of the circuit (hope this makes sense)
2) Yeah energy transfer: Using source-> input transducer -> modulator -> demodulator -> output transducer -- used in the transmission of a signal/data (such as audio)
Opto-electric devices specifically talks about LED's and LDRs, you could potentially be asked about the benefits of using an LED over an LDR in the process of transmission through modulation. (it's more immediate so the signal would be more accurate)
Hope this helps