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Starter track

Follow the authored sequence, or switch to recap mode for a faster review of the same path.

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Starter track6 concepts2 checkpoints160 min

Electricity

Not started

Start with source charges and voltage, then carry that same circuit story into current, power, branch behavior, and equivalent resistance.

Use this track when electricity still feels split between field language, voltage language, and circuit rules. The path stays beginner-first: charges create fields, fields and potential explain voltage, basic circuits make that voltage usable, and the later steps reuse the same story for power, branches, and reduction.

Field causeVoltage bridgePower and energyBranch reduction

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.

Begin with Electric Fields
  1. Quick testNot started4 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
    Open Electric Fields quick test
  2. ChallengeNot started10 checks

    Voltage bridge checkpoint

    Use the existing midpoint challenge to verify the field-to-potential bridge before the path widens into circuits.

    No saved checkpoint attempt yet.

    Potential
    Open Positive midpoint plateau

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.

  1. 1Not startedMastery: NewStart 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
    Start concept
  2. 2Not startedMastery: New

    Electric Potential

    Map how source-charge sign and distance shape electric potential, compare potential differences across one honest scan line, and connect the downhill slope of V to the electric field.

    Builds on Electric Fields before setting up Basic Circuits.

    ElectricityIntro25 min
    Open concept
  3. Checkpoint 1LockedNot started

    Voltage bridge checkpoint

    Lock in the midpoint case where the field can vanish while the potential stays positive before you carry that voltage idea into live circuits.

    Finish Electric Potential first. This checkpoint ties together E-fields and Potential through Positive midpoint plateau.

    Pause here after Electric Potential before moving into Basic Circuits.

    E-fieldsPotential10 checksCoreGraph-linkedGuided start
    Return to PotentialOpen concept
  4. 3Not startedMastery: New

    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.

    ElectricityIntro25 min
    Open concept
  5. 4Not startedMastery: New

    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.

    ElectricityIntro25 min
    Open concept
  6. 5Not startedMastery: New

    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.

    ElectricityIntro30 min
    Open concept
  7. 6Not startedMastery: New

    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.

    ElectricityIntro30 min
    Open concept
  8. Checkpoint 2LockedNot started

    Reduction checkpoint

    After the single-loop power story and the branch comparison are in place, collapse the highlighted grouped pair honestly to finish the introduction.

    Finish Equivalent Resistance first. This checkpoint ties together Circuits, Circuit power, Series / Parallel, and R_eq through Collapse the parallel group.

    Final checkpoint that closes the authored track after Equivalent Resistance.

    CircuitsCircuit powerSeries / ParallelR_eq8 checksCoreGraph-linkedGuided start
    Return to R_eqOpen concept