Physics 12 Week 12 · Energy Efficiency Design Lab

Model rules and safety

Efficiency = useful output energy / energy input (0–100%) in an ideal no-stored-energy-change accounting model. E_input=E_useful+E_other and each average power uses the same elapsed time. An actual device could have changing stored energy and other unmodeled flows.

1. Prediction and numerical controls

Prediction before adjusting the variables

Energy input 400 J

Duration of transfer 5 s

Useful output fraction 75 %

Import JSON

2. Energy accounting diagram

Diagram uses the same joule-scale and includes numerical labels for nonvisual comparisons.

3. Interactive comparison graph

Calculated comparisons (fictional)
Efficiency (%)	Useful energy (J)	Other transferred energy (J)

4. Engineering notebook

Design brief: Supply no more than 500 J input, at least 300 J useful output, and complete within 6 s. The result panel reports whether all constraints are met together. Consider a real-world requirement beyond this simplified energy-only model.

Browser-local simulated trials
#	Input (J)	Efficiency (%)	Time (s)	Useful (J)	Other (J)	Constraints

Claim, model results with units, limitations and correction

Download conversion efficiency synthetic dataset

5. Seven-round physics game

Seven randomized cases, sampled without repetition from eleven. Each has one scored answer and immediate explanatory feedback.

Start a new challenge.

Score: 0 / 7