Power: watts and energy per second
Define power as the rate of energy transfer (power = energy ÷ time, measured in watts), and compare energy transfer rates in different everyday contexts
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Power: watts and energy per second means practising the idea at the table with a simple hands-on check. We will demo once, then your child tries.
Materials: A battery, bulb, and wires OR a warm/cool cup comparison setup; Paper for a simple energy-path note. 1. Say the goal of Power: watts and energy per second in plain words once. 2. Adult shows one energy transfer (circuit lights, or heat moving to a cooler hand nearby) and names the path. 3. Child traces or describes three energy paths and says what changed. 4. Fresh check: one fresh energy-path description. Record and stop. Done: three energy-path notes with a before/after change. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.
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Start practicePower: watts and energy per second practice
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Learning resources
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PhET Interactive Simulations · Practice link — not the full lesson
Energy Forms and Changes
Before you open · source notes
Energy Forms and Changes supports hands-on exploration for Power: watts and energy per second. Not every lab worksheet.
Free interactive page, no sign-in required for the tested path.
Before you openAsk the learner what they changed in the sim or page and what they observed.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public PhET Interactive Simulations page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
PhET Interactive Simulations. “Energy Forms and Changes.” External page; Gakuva does not copy, host, embed, or redistribute materials.
Unknown — link only
Check understanding
- States the definition of power and gives its unit (watt)
- Uses P = E/t to calculate power, energy, or time given the other two quantities
- Compares the power ratings of common appliances and explains what the rating means
- Explains why a higher-powered device does the same job faster but uses more energy
“If your child was comparing a 100 W light bulb with a 10 W LED, could they explain what those numbers mean and calculate how much energy each uses in an hour?”
Curriculum record
- Type
- Conceptual
- Subject
- Science
- Domain
- Energy
- Age range
- Ages 12–13
Standards