Domain: Natural Science — Physics
Target concept: Open circuit

Video generation prompt: A battery power source, an LED lamp, and a single-pole switch are connected in series on the table to form a closed-loop circuit. The single-pole switch lever is moved from the closed position to the open position, separating its electrical contacts.

Evaluation guide:
(i) Target concept: Electrical continuity determines current flow in a simple DC circuit.
Minimum mechanism: Battery provides electromotive force; LED requires forward-biased current to emit photons; single-pole switch controls continuity by physically separating conductive contacts; no alternative conduction paths exist.
(ii)Storyline: Frame opens on stable tabletop scene showing three labeled objects in series configuration with switch closed and LED lit. Then, switch lever rotates smoothly around fixed pivot, contacts visibly separate, and LED extinguishes *during* that motion. No object moves out of frame, no lighting changes, no cuts: all events occur in one continuous take from fixed frontal viewpoint. Final frame holds open switch and unlit LED for ≥1 second with full visibility of contact gap and LED lens.

Manual:
Experimental Procedure
1. Place a battery, an LED lamp, and a single-pole switch side-by-side on a tabletop.
2. Connect them in series using wires: battery (+) → LED anode → LED cathode → switch input → switch output → battery (−).
3. Ensure switch is initially closed (contacts touching).
4. Open the switch by rotating its lever to separate contacts.
Observation of Experimental Phenomena
The LED lamp is lit when the switch is closed and turns off immediately when the switch is opened.
Summary of Experimental Principles
An open circuit breaks the current path; no current flows, so the LED cannot emit light. A closed circuit allows current flow from the battery through the LED, causing it to illuminate.

Prompt Grounding rubric:
level_1: No battery, no LED lamp, no single-pole switch visible on the tabletop; or two or more of these three components are missing entirely; or the objects are not resting on a tabletop surface; or there is no discernible arrangement resembling a circuit at all.
level_2: The battery, LED lamp, and single-pole switch are all present and placed on the tabletop, but they are not wired into a single series loop: for example, a wire is missing or left dangling, the switch is wired in parallel or bypassed, or a segment of the loop is absent so the path does not close.
level_3: The battery, LED lamp, and single-pole switch are all present on the tabletop and visibly joined by continuous wires or direct metal contacts into one series loop; the switch begins the shot in the closed position with its contacts touching; no other prop crowds or obscures the three components.
level_4: Everything described at the 3-point level is present, and in addition the switch is shown moving through two clearly distinguishable states within the same continuous shot: first closed with contacts touching, then open with a visible air gap between the contacts, with no cut, splice, or object substitution between the two states.
level_5: Everything described at the 4-point level is present, and in addition the battery, LED lamp, and switch stay in the exact same layout on the tabletop from first frame to last (none of them slides, lifts, or swaps position), the connecting wires stay taut and unbroken throughout, and the switch lever completes a single smooth closed-to-open motion with no stutter, reversal, or repeated back-and-forth actuation.

Scientific and Causal Correctness rubric:
level_1: The LED's behavior is the reverse of correct circuit continuity (it is lit while the switch sits open and dark while the switch sits closed), or the LED shows no dependence on the switch at all, staying identically lit (or identically dark) in both the closed and the open configuration.
level_2: The LED responds in the right general direction but not correctly: it only dims to a partial glow rather than going fully dark once the switch is open (implying current is still somehow flowing across the open gap), or it flickers on and off erratically as the switch is actuated, or its brightness change lags a second or more behind the switch actually finishing its motion.
level_3: The LED is fully lit while the switch is closed and completely dark while the switch is open, correctly showing that separating the switch contacts removes current from the loop and turns off the light source that depends on it.
level_4: Everything described at the 3-point level holds, and in addition the LED's transition from lit to dark occurs specifically while the switch lever is moving through its opening motion (not measurably before the contacts begin to separate and not measurably after they have fully parted), with no partial or flickering glow during the transition, and once dark the LED stays off for at least one full second before the shot ends.
level_5: Everything described at the 4-point level holds, and in addition the LED going dark reads as simultaneous with the contacts visibly parting, with no lingering afterglow and no residual light escaping the lamp housing once the circuit is open.

Spatiotemporal Consistency rubric:
level_1: Objects teleport: the battery, LED lamp, or switch appears, disappears, or jumps to a new spot on the tabletop without visibly moving there; or a wire snaps apart and reforms without any visible cause; or the tabletop lighting shifts abruptly with no cause (e.g., a shadow disappears mid-shot or the key light flips to the opposite side) unrelated to the switch action; or the camera cuts, jumps, or reframes abruptly partway through the shot.
level_2: The switch lever changes position with no visible pivot or mechanical link holding it (e.g., it appears to float or rotate around no fixed axis); or the LED changes brightness with no corresponding movement of the switch lever; or a wire segment stretches, compresses, or passes through another object instead of resting naturally on the tabletop.
level_3: The battery, LED lamp, and switch stay visible and in a coherent spatial arrangement throughout the shot; the switch lever visibly pivots around one fixed point as it moves; the wires connecting the three components keep a consistent shape, length, and connection at both ends from the first frame to the last.
level_4: Everything described at the 3-point level holds, and in addition the switch lever's motion from closed to open is smooth and physically continuous (it turns in one direction without pausing, reversing, or jumping partway), and the LED's brightness changes only while the lever is actually moving, never during a moment when the switch is held still.
level_5: Everything described at the 4-point level holds, and in addition the gap between the switch contacts stays clearly visible and consistent in size once the lever stops moving, the LED lens and lamp housing keep their shape and position with no warping or misalignment, and the wires stay attached to the same terminals on the battery, LED, and switch for the entire shot with no visible slippage or reattachment.