Domain: Engineering — Energy Engineering
Target concept: Photovoltaic Power Generation

Video generation prompt: Fix the small monocrystalline silicon solar panel on the experimental platform, connect it to a micro LED light source, and switch between natural light illumination and dark conditions. A fixed camera is used to record the entire process.

Evaluation guide:
(i) Target concept: Photovoltaic energy conversion in monocrystalline silicon under variable illumination.
Minimum mechanism: Incident photons excite electrons in the silicon lattice → generate voltage across the panel terminals → sufficient voltage/current drives the micro LED to emit light, with LED brightness scaling continuously with the panel's photocurrent as illumination changes; no external power source involved.
(ii)Storyline: [Phase 1] Static wide shot establishes fixed viewpoint showing platform, panel, and LED in natural light: panel is visibly mounted, wires connect panel to LED, LED is ON. [Phase 2] Ambient light gradually dims (e.g., cloud cover, a hand blocking the panel, or a controlled shutter); LED luminance decreases continuously and extinguishes fully before darkness stabilizes. [Phase 3] Scene remains dark; LED stays OFF, panel unchanged. [Phase 4] Light gradually returns; LED luminance increases continuously in step with the returning ambient light until it stabilizes at its original full brightness. All phases occur within same fixed frame; no cuts, no repositioning, no object entry/exit; panel and LED maintain rigid spatial relationship throughout.

Manual:
Experimental Procedure
1. Place small monocrystalline silicon solar panel flat on experimental platform.
2. Connect panel terminals to micro LED light source using thin insulated wires.
3. Illuminate scene with natural light → observe LED turns ON.
4. Block natural light (create dark condition) → observe LED turns OFF.
Observation of Experimental Phenomena
- Under natural light: micro LED emits visible light; panel surface appears uniform dark blue/black with subtle specular highlight.
- Under dark condition: micro LED is completely unlit; panel surface retains same color and texture.
Summary of Experimental Principles
Monocrystalline silicon solar panels generate electric current when exposed to photons in natural light; this current powers the connected micro LED. In absence of light, no current is generated, so LED remains off — demonstrating direct photovoltaic energy conversion.

Prompt Grounding rubric:
level_1: No small monocrystalline silicon solar panel visible, OR no micro LED light source visible, OR no experimental platform visible, OR the camera view is not fixed (e.g., panning, tilting, zooming, or cutting between multiple angles).
level_2: Only one of the three core setup elements is present and correctly identified (small monocrystalline panel on a platform, micro LED connected to the panel, or a depicted natural-light/dark transition), while at least two of these are missing or misidentified (e.g., a polycrystalline-looking panel, an incandescent bulb standing in for the micro LED, or no visible platform).
level_3: All three core elements are present and correctly identified: (a) small monocrystalline silicon panel, (b) experimental platform, (c) micro LED, AND the panel visibly sits on the platform AND the LED is visibly wired to the panel AND both a natural-light state and a dark state are shown as visually distinct, BUT the setup order is wrong (e.g., LED wired before the panel is placed) or the video does not visually support any link between the illumination state and the LED's behavior.
level_4: All score 3 elements are satisfied AND the setup unfolds in the correct order: panel placed on the platform first, LED wired to the panel second, natural-light state shown with the LED lit, then the dark state shown with the LED unlit, AND every transition occurs within one continuous fixed-camera shot with no cuts or repositioning AND no extraneous object (a hand, a tool, a label) dominates the frame or blocks the panel, platform, or LED.
level_5: All score 4 elements are satisfied AND the panel surface keeps a uniform dark blue/black monocrystalline look with a soft specular highlight (not a bluish-purple, grey, or metallic sheen) throughout AND the connecting wires stay thin and are visibly attached to the panel terminals and the LED leads for the whole sequence AND no visual artifact (clipping, bloom, ghosting, or an object popping in or out of view) makes it hard to recognize the panel, platform, or LED at any point.

Scientific and Causal Correctness rubric:
level_1: The LED's on/off state is reversed relative to the light condition in both steady phases (ON while the scene is dark AND OFF while lit by natural light), OR the LED clearly emits light while its wires are visibly disconnected from the panel (implying an unseen power source), OR the panel is shown cracked, warped, or otherwise structurally broken while the LED still lights up as if current were still flowing.
level_2: The LED's on/off state contradicts the light condition in exactly one of the two steady phases (either OFF while lit by natural light, or ON while the scene is dark, but not both), OR the LED's on/off changes appear unrelated to the dimming/brightening of the ambient light (e.g., it switches at a moment when the light level is not actually changing).
level_3: The LED is ON throughout the natural-light phase and OFF throughout the dark phase, and its state changes occur in step with the dimming/brightening of the ambient light, BUT the brightness change during the dimming and/or brightening transition happens as a sudden jump rather than a gradual ramp, OR the wire path from the panel terminals to the LED leads is not clearly continuous, leaving how power reaches the LED ambiguous.
level_4: All score 3 elements are satisfied AND the LED's brightness visibly ramps up and down gradually during both the dimming and the brightening transitions, tracking the change in ambient light, AND the wires form a visibly unbroken path from the panel terminals to the LED leads; but the ramp may be noticeably smoother in one transition than the other, or there may be a brief mismatch between when the ambient light starts changing and when the LED begins to respond.
level_5: All score 4 elements are satisfied with no exceptions: the LED's brightness rises and falls as a smooth, continuous change tracking the ambient light in both the dimming and the brightening transitions (never a sudden jump), reaching complete extinguishment only once the scene is fully dark and full brightness only once natural light is fully restored, with the direction of the LED's brightness change always matching the direction of the ambient light change, clearly showing that the panel's own generated current, not any external supply, is what drives the LED.

Spatiotemporal Consistency rubric:
level_1: The camera viewpoint changes at any point (panning, tilting, zooming, or cutting to a different angle), OR the panel, platform, or LED visibly jumps to a different position between one frame and the next, OR the panel or LED breaks apart or detaches with no visible cause, OR the scene switches between full brightness and full darkness with no visible transition at all (an instant cut rather than any gradual change).
level_2: The camera viewpoint stays fixed and no object jumps position or breaks apart, BUT at least two of the following occur: the panel or LED rotates or shifts without a continuous path of motion; the LED's illumination switches on and off repeatedly within a moment rather than following the dimming/brightening trend; the ambient light appears or disappears in patches instead of across the whole scene at once; the shadows cast by the panel and platform swing to a new direction with no corresponding change in where the light is coming from.
level_3: The camera viewpoint stays fixed, no object jumps position or breaks apart, and the ambient light does not change in unexplained patches; BUT the panel, platform, or LED shows visible unintended movement (trembling, drifting sideways, or appearing to hover above the platform), OR the dimming/brightening of the ambient light happens as a sudden jump in brightness rather than a gradual change, OR the shadows cast by the panel and platform shift in a way that does not match the direction the light is fading from or returning toward.
level_4: All score 3 elements are satisfied AND the panel, platform, and LED stay physically settled in place with no hovering or sudden jumps in motion AND the ambient-light transition changes brightness gradually and in a single direction through each phase (it does not partially reverse mid-dim or mid-brighten) AND the shadows cast by the panel and platform shift in step with the changing light level while keeping the same overall direction and softness; but a brief hesitation, such as a momentary freeze in motion or a slight camera resettle, may still occur.
level_5: The camera viewpoint shows no perceptible drift, wobble, or refocusing at any point AND the panel, platform, and LED remain rigidly positioned relative to one another with no visible vibration or shift in relative depth AND the dimming and the brightening of the ambient light are each smooth and continuous from start to finish, spreading evenly across the whole scene rather than in isolated patches AND the shadows cast by the panel and platform keep the same direction and softness throughout, only growing, shrinking, or fading in step with the changing light level.