Domain: Engineering — Electrical Engineering
Target concept: A momentary push-button switch drives the LED on only while held down and off immediately upon release, with no latched on-state or off-state.

Video generation prompt: A desktop circuit demonstrates a momentary push-button switch connected to a power source and a single LED with a resistor, while a hand repeatedly presses and releases the button.

Evaluation guide:
(i) Target concept: A momentary mechanical switch controls LED state via transient circuit closure.
Minimum mechanism: Physical contact between switch terminals must complete a series path including power source → resistor → LED → switch → power return; opening the switch must break this path completely, stopping current and extinguishing the LED.
(ii)Storyline: Frame 0–1: Static setup showing all components in place, button unpressed, LED off. Frame 2–3: Hand approaches and contacts button. Frame 4: Button depressed → LED illuminates. Frame 5: Hand retracts. Frame 6: Button returns to open state → LED extinguishes. Frame 7–8: Repeat press-release cycle. Perspective: Fixed frontal desktop view, no camera motion, full visibility of hand, switch, LED, resistor, and power connections at all times.

Manual:
Experimental Procedure
1. Place momentary push-button switch, LED, current-limiting resistor, and power source on desktop in fixed arrangement.
2. Connect resistor in series between power source and LED anode; connect LED cathode to switch terminal; connect other switch terminal to power source return.
3. Use hand to press and release button repeatedly.
Observation of Experimental Phenomena
LED illuminates only while button is pressed; LED extinguishes immediately upon button release. Illumination and extinction occur synchronously with button contact and separation.
Summary of Experimental Principles
A momentary push-button switch closes the circuit only while it is physically held down, allowing current to flow through the resistor and LED solely during actuation; releasing the button reopens the circuit and extinguishes the LED immediately, with no latched on-state or off-state as a toggle switch would produce.

Prompt Grounding rubric:
level_1: No momentary push-button switch, no LED, no resistor, no power source visible; or no hand present; or no pressing/releasing action shown.
level_2: At least one of: push-button switch present, LED present, resistor present, power source visible, or hand present; but fewer than three core objects present AND no pressing action visible.
level_3: All four core objects present (momentary push-button switch, LED, current-limiting resistor, power source) AND hand visible in frame AND hand makes contact with button at least once, but pressing and releasing are not both visually distinguishable as discrete events.
level_4: All four core objects present AND hand visible AND at least two complete press-release cycles shown, where each press is followed by release before the next press begins, but LED state change is not synchronized with button contact in all cycles.
level_5: All four core objects present AND hand visible AND at least two full press-release cycles shown, where each press event (hand contacting button) is immediately followed by LED illumination AND each release event (hand disengaging button) is immediately followed by LED extinction, with no ambiguity in temporal alignment between hand action and LED state.

Scientific and Causal Correctness rubric:
level_1: LED remains constantly on, constantly off, or changes state without any correlation to button action; or LED color/state violates electrical constraints (e.g., white LED glowing without current path, or resistor absent while LED lit).
level_2: LED turns on during button press but stays on after release, OR turns off during press but illuminates after release; or LED appears lit without resistor visibly in series with it AND no alternative current-limiting mechanism shown.
level_3: LED illuminates only when button is pressed AND extinguishes only when button is released, but illumination/extinction is delayed or inconsistent across cycles (e.g., lights on during second press but not first); or resistor is present but not visibly connected in series between power source and LED.
level_4: LED illuminates exclusively during button press AND extinguishes exclusively during button release across all visible cycles, AND resistor is visibly placed in series between power source and LED, but LED color is inconsistent with standard red/green/yellow (e.g., blue LED shown with no indication of appropriate voltage/current capability).
level_5: LED illuminates only during button press AND extinguishes only during button release across all cycles, AND resistor is visibly and unambiguously connected in series between power source and LED, AND LED color is consistent with common low-voltage indicator LEDs (red, green, yellow, or amber), AND no current path exists when button is open (open-circuit visualized via air gap or switch contacts visibly separated).

Spatiotemporal Consistency rubric:
level_1: The switch, LED, resistor, wiring, or power source vanishes, duplicates, or snaps to a new position on the desktop between frames without the hand touching it; the button changes position on its own without the hand making contact; the hand and button appear to pass through each other rather than making physical contact; a wire visibly detaches from a component or the circuit board fractures apart with no cause; or the desktop lighting swings abruptly between bright and dark with no change in light source.
level_2: The hand's approach toward the button or its withdrawal afterward is not a smooth continuous motion (it skips or jumps partway across the desktop), the LED's brightness passes through visibly distinct partial-glow stages instead of switching cleanly, or the shadow the hand casts on the desktop and switch does not track the hand's own motion, for example it points a different way than the hand itself, or its shape jumps between frames even though the hand has moved only slightly.
level_3: The switch, LED, resistor, power source, and connecting wires stay in the same fixed layout relative to one another for the entire sequence, the hand's motion toward and away from the button is smooth rather than jerky, and the LED switches cleanly between on and off with no flicker or ghosting; but the hand's speed changes noticeably and unnaturally partway through at least one press-release cycle.
level_4: All of the fixed-layout and clean-switching criteria above hold for every press-release cycle shown, the hand's motion is smooth and evenly paced with no unnatural speed changes in any cycle, and the shadow the hand casts on the desktop and switch shifts smoothly in step with the hand's own approach-and-retract motion in every cycle, never freezing or jumping independently of the hand; but the LED's dimming or brightening moment lags noticeably behind the hand's contact or release in at least one cycle.
level_5: Every press-release cycle shows the same fixed component layout, smooth and naturally paced hand motion, a hand-cast shadow that tracks the hand's motion smoothly and consistently in every cycle with no independent freezing or jumping, and an LED that switches on as contact is made and off as the button is released with no noticeable lag, flicker, ghosting, or positional drift in any component across the whole sequence.