Starter track160 min
Electricity
Not startedStart with source charges and voltage, then carry that same circuit story into current, power, branch behavior, and equivalent resistance.
Field causeVoltage bridge
Starter track
Follow the authored sequence, or switch to recap mode for a faster review of the same path.
Entry diagnostic
Decide where to enter this path without opening a second testing system.
Reuse the electric-fields quick test and the voltage-bridge checkpoint challenge to decide whether to start from source charges or jump straight into the first live circuit loop.
Start from beginning0 / 2 probes ready
Test the field-to-voltage bridge before entering circuits
Start from beginning
No saved diagnostic checks are available yet, so the opening concept is still the best place to start.
Uses the same local-first quick tests, checkpoint challenges, and track history already saved in this browser.
- Quick testNot started5 questions
Electric-fields quick test
Check whether source charges and the probe-field picture are still stable before voltage takes over.
No saved quick-test result yet.
E-fields - ChallengeNot started10 checks
Build a positive midpoint with zero field
Starting from Dipole reference, adjust the setup until the midpoint has almost zero field but still clearly positive potential.
No saved checkpoint attempt yet.
Potential
About this track
Keep the first scan focused on the next lesson. Open the authored rationale and shared-framework notes only when you need them.
About this track
Keep the first scan focused on the next lesson. Open the authored rationale and shared-framework notes only when you need them.
Why this order
The sequence is authored to keep the model honest.
Electric fields comes first because source charges are the physical cause underneath every later voltage idea. Electric potential turns that into the scalar voltage story, basic circuits reuses voltage with current and resistance, power and energy in circuits keeps the same simple loop while introducing rate and total, series and parallel circuits then adds branch structure, and equivalent resistance closes by reducing that branched circuit honestly.
Shared concept pages
Each step opens the same simulation-first framework.
Compare mode, prediction mode, quick test, worked examples, guided overlays, challenge mode, and read-next cues stay on the concept pages. The track only decides the guided order and the next recommended stop.
Guided path
Follow the concepts and checkpoint moments in order.
Checkpoint cards reuse the authored challenge entries already living on the concept pages.
- 1Not startedNewStart here
Electric Fields
See how source-charge sign, distance, and superposition set the electric field at one probe, then watch a test charge turn that field into a force without changing the field itself.
Start here before moving into Electric Potential.
ElectricityIntro25 min - 2Not startedNew
Electric Potential
Map how source-charge sign and distance shape electric potential, read voltage as a difference across one shared horizontal scan line, and connect the downhill slope of V to the electric field.
Builds on Electric Fields before setting up Basic Circuits.
ElectricityIntro25 min - Checkpoint 1LockedNot started
Build a positive midpoint with zero field
Starting from Dipole reference, adjust the setup until the midpoint has almost zero field but still clearly positive potential.
Finish Electric Potential first. This checkpoint ties together E-fields and Potential through Build a positive midpoint with zero field.
Pause here after Electric Potential before moving into Basic Circuits.
E-fieldsPotential10 checksCoreGraph-linkedGuided start - 3Not startedNew
Basic Circuits
Keep one battery and two resistors in view while current, voltage, resistance, Ohm's law, and the contrast between series and parallel all stay tied to one honest circuit.
Builds on Electric Potential before setting up Power and Energy in Circuits.
CircuitsIntro25 min - 4Not startedNew
Power and Energy in Circuits
Keep one source and one resistive load in view while current, power, and accumulated energy over time stay tied to the same honest circuit.
Builds on Basic Circuits before setting up Series and Parallel Circuits.
CircuitsIntro25 min - 5Not startedNew
Series and Parallel Circuits
Switch the same two loads between one loop and two branches, then track how current, voltage, brightness, and charge flow reorganize without changing the battery.
Builds on Power and Energy in Circuits before setting up Equivalent Resistance.
CircuitsIntro30 min - 6Not startedNew
Equivalent Resistance
Reduce one highlighted resistor group into an equivalent block, then collapse the whole mixed circuit honestly and watch how the total current and grouped behavior change together.
Capstone step after Series and Parallel Circuits.
CircuitsIntro30 min - Checkpoint 2LockedNot started
Build the 3 ohm parallel group
Starting from the balanced series group, change only the grouped connection until the highlighted pair is about 3 ohm and the full circuit is about 7 ohm.
Finish Equivalent Resistance first. This checkpoint ties together Circuits, Circuit power, Series / Parallel, and R_eq through Build the 3 ohm parallel group.
Final checkpoint that closes the authored track after Equivalent Resistance.
CircuitsCircuit powerSeries / ParallelR_eq8 checksCoreGraph-linkedGuided start