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
Lesson
Set out your lesson
“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.”
Bring to the table
- A battery, bulb, and wires OR a warm/cool cup comparison setup
- Paper for a simple energy-path note
Extra for the adult
Worked example. Battery → wires → bulb: chemical energy becomes light (and some heat).
Optional challenge. For Power: watts and energy per second, add one harder example after success.
What to notice. Keep one parent note: examples tried; results; support used. This session samples Power: watts and energy per second, not mastery.
Share and support
Family records and proof options
Keep a record of your learning
Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.
Practice this concept
Start practicePower: watts and energy per second practice
Practice key ideas from Power: watts and energy per second.
Free · no login · no ads · Practice answers and completion are not saved. Parent observation remains the lesson record.
Learning resources
Extra practice links — they do not replace Gakuva’s teaching approach.
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