What Happens When a Cadmium Sulfide Photo-resistor Is Placed in This Circuit?

What happens when the cadmium sulfide photo-resistor circuit is in a dark environment? Use this video to learn how to implement the Quick Quiz and authentically engage your students in dialogue surrounding circuit electronics.

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What are Quick Quizzes?
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Quick Quizzes (QQs) are carefully designed problems that allow teachers to easily engage their students in authentic discourse about natural phenomena. To minimize barriers to entry, we focus on systems that require minimal prep time and use mostly readily available materials. This is one video of many across the high school physics curriculum that aims to prepare teachers to engage their students authentically.

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‼️ Disclaimer: This demonstration involves high-voltage equipment that can pose
serious electrical and safety hazards. It is shown here for educational purposes
only and is not meant for commercial use or unsupervised replication. Please do
not attempt to replicate this experiment unless you are trained in high-voltage
safety and working in a properly equipped laboratory. Teachers and students
should use video demonstrations like this one rather than trying to recreate the
setup. If you choose to replicate any experiment, you do so at your own risk. We
are not responsible or liable for any harm, injury, or damages that may result from
attempting these experiments. Always consult with a qualified professional or
educator before conducting any experiment that could pose a risk to your health or
safety. © 2025 Idealized Science Institute. All rights reserved.

🕰️ Timecodes 🕰️
0:00 Introduction
2:29 Hold up the Quick Quiz
3:12 Typical Student Responses
4:10 Quick Quiz Explanation
13:32 Building the circuit
15:54 Real World Application
16:35 Outro