
Physics Investigating RC Circuit Time Constants: Pre-Lab Notes, Teacher Notes and Technician Guide
This pre-lab resource prepares students for a practical investigation of the time constant in RC (resistor–capacitor) circuits. It provides structured guidance on the core ideas, apparatus, measurements and safety points needed before laboratory work begins.
Keeping it Simple
This pack introduces RC circuit behaviour in a clear, manageable way. It focuses on what students must understand and do: how a capacitor charges and discharges through a resistor, how voltage changes with time, and how the time constant is determined from data.
What’s Included in This Pre-Lab Pack
- Student Pre-Lab Notes
Clear explanation of RC circuits and exponential charging/discharging
Definition of the time constant (τ = RC) and what it represents
Diagram of a typical setup (power supply, resistor, capacitor, switch, voltmeter or data logger)
Step-by-step outline of the procedure and how to record voltage vs time
Guidance on identifying variables and keeping conditions consistent
Worked examples showing how to estimate τ from graphs
Prompts for plotting voltage–time graphs and recognising exponential trends
Notes on uncertainty and error sources (connection resistance, timing delay, instrument response)
Safety reminders for electrical equipment and secure connections
Short exam tips linked to exponential graphs and circuit behaviour
- Teacher Notes
Background theory linking RC behaviour to exponential change
Suggested pre-lab questions to check understanding
Common student difficulties (starting measurements at the correct time, graph interpretation)
Differentiation ideas for varied confidence in maths and graphs
Assessment opportunities based on data processing and explanation
- Technician Preparation Guide
Equipment list (power supply, resistors, capacitors, leads, switches, meters or data loggers)
Setup and station organisation notes
Health and safety reminders for safe circuit construction
Preparation guidance for reliable electrical connections
Troubleshooting tips for unstable or noisy readings
Audio Summary for Enhanced Learning
Short podcast-style audio summary included
Explains the aim, setup and key analysis ideas in accessible language
Highlights important safety and measurement points
Useful for pre-lab preparation or quick revision
Ideal For
IB DP Physics classes studying circuits
Students who benefit from structured pre-lab guidance
Teachers and technicians who want consistent, clear setup information
This resource supports practical physics preparation by emphasising clarity, safe practice and reliable measurement and analysis skills.
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