Ohm's Law: voltage, current, resistance
Apply Ohm's Law (V = IR) to calculate current, voltage, or resistance in a simple circuit, and explain that resistance opposes the flow of current
Lesson
Set out your lesson
“Ohm's Law: voltage, current, resistance 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 Ohm's Law: voltage, current, resistance, add one harder example after success.
What to notice. Keep one parent note: examples tried; results; support used. This session samples Ohm's Law: voltage, current, resistance, not mastery.
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1 approach
Ohm's Law: voltage, current, resistance 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 Ohm's Law: voltage, current, resistance 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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Practice this concept
Start practiceOhm's Law: voltage, current, resistance practice
Practice key ideas from Ohm's Law: voltage, current, resistance.
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Learning resources
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PhET Interactive Simulations · Practice link — not the full lesson
Ohm's Law
Before you open · source notes
Ohm's Law supports hands-on exploration for Ohm's Law: voltage, current, resistance. 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.
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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. “Ohm's Law.” External page; Gakuva does not copy, host, embed, or redistribute materials.
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Check understanding
- States Ohm's Law as V = IR and identifies the units for each quantity
- Rearranges V = IR to find the unknown value given the other two
- Explains that resistance opposes current flow and identifies factors that affect resistance (material, length, thickness)
“If your child doubles the resistance in a circuit while keeping the battery the same, can they predict what happens to the current and explain using the V = IR formula?”
Curriculum record
- Type
- Procedural
- Subject
- Science
- Domain
- Energy
- Age range
- Ages 12–13
Standards