A No-Prep Sub Plan for Energy Transfer (Science & Health, Grades 6–12)

The sub plan problem in science is specific: you need a lesson that keeps a Grades 6–12 class working for a full period, requires no equipment, no lab supervision, and no subject knowledge from the adult in the room, and still produces something you can use when you return. Energy transfer suits this better than most topics because the phenomena are everywhere and the reasoning is written rather than practical. Here is a self-contained plan you can leave in a folder and use for any absence.

What the covering teacher needs on one page

Write the instructions for someone who has never taught science. That means no terminology in the teacher notes, timings on every phase, and an explicit statement of what students hand in. Three lines at the top do most of the work: students are working individually and silently for the first fifteen minutes, all resources are on the desk in a labeled folder, and every student hands in the double-sided sheet at the end whether it is finished or not. Add a named colleague in a nearby room for anything unexpected. Do not include an optional extension activity that depends on judgment, because a cover teacher cannot make that call and will skip it.

The lesson, phase by phase

1. Starter, eight minutes. Students list six situations from the last twenty-four hours where energy moved from one place to another, and mark each one as mostly heating, mostly moving, or mostly light or sound. No definitions required. Purpose: activates existing knowledge and produces a personal example bank for the rest of the lesson.
2. Reading with a task, fifteen minutes. A one-page text describing three energy transfers, each with a diagram. Students annotate: circle where energy starts, underline where it ends, box the part where some of it is wasted. Purpose: the annotation is the comprehension check, and it is visible from across the room, so the cover teacher can see who is off task without knowing the content.
3. Main task, twenty minutes. Students complete four transfer chains, each written as a sentence rather than drawn, and then write two sentences on where energy is lost in each. Purpose: this is the substance of the lesson and the part you will actually grade.
4. Closing task, ten minutes. One question, written answer: "Energy is never destroyed. Explain why devices still waste it." Purpose: separates students who have the conservation idea from those who have only the vocabulary, in a single paragraph you can sort in seconds.

The materials you need for phases two and three are a text with diagrams and a set of graded questions, which is exactly the format an instant-download unit provides in a printable form. A resource covering energy changes and how catalysts and conditions affect them, such as Gibbs Free Energy & Heterogeneous Catalysis, gives you a bank of printable pages and answer keys you can pull a cover lesson from at the level your class is working at.

What to leave out of a cover lesson

No practical work, no matter how simple, because supervision expectations differ and a cover teacher should never have to make a safety judgment about your equipment. No group work that requires the room to be rearranged. No task that needs a device login, since account problems consume the period. And no video, because a class that watches something without a written task produces nothing you can act on and the cover teacher has nothing to manage the room with. The plan above is deliberately paper only and deliberately individual.

Using what comes back

Grade only the closing question, and sort into three piles: has conservation, has the words only, has neither. That tally tells you exactly where to restart when you are back, and it takes about six minutes. If most of the class landed in the middle pile, the return lesson is a single worked chain with the wasted energy quantified rather than described.

A cover day is also a good slot for data work, since reading a graph and answering questions about it is self-contained, requires nothing from the adult in the room, and produces markable evidence. The structured analysis tasks in Climate Change Data Lab – Understanding Climate Change Through Real Data work well as an alternative cover lesson at the same grade level, and for older classes the more developed treatment in Climate Change and the Anthropogenic Greenhouse Effect | Analysis, Impacts & Future Perspectives gives energy transfer a global context once your class is back with you and can handle the discussion properly. Keep both printed in the same folder as the energy plan. The measure of a good sub plan is that you come back to a stack of completed sheets and a note from the cover teacher saying the class knew what to do.

Related reading from the Teacher Hub

• Using Digital Tools to Teach Food Chemistry (Science & Health, Grades 6–12)
• A Project-Based Unit on Photosynthesis: Planning It Week by Week (Science & Health, Grades 6–12)
• Revision and Exam Preparation for Electricity and Magnetism (Science & Health, Grades 6–12)