Domain: Engineering — Electrical Engineering
Target concept: A hand-cranked generator illuminates a bulb by manual rotation.

Video generation prompt: A person turns a hand-cranked generator on a table, which is connected to a small transparent lamp. The speed of rotation varies, sometimes fast, sometimes slow, and occasionally stops.

Evaluation guide:
(i) Target concept: Electromechanical energy conversion via electromagnetic induction in a hand-cranked DC generator driving a resistive/incandescent lamp load.
Minimum mechanism: Crank rotation must drive a coil within a magnetic field to generate current; current must flow through a closed circuit including the lamp; lamp must be a simple resistive load (e.g., incandescent or clear-glass LED) whose brightness monotonically increases with input power.
(ii)Storyline: Frame 0–t₁: Person’s hand contacts crank handle; lamp unlit. t₁–t₂: Crank rotates rapidly → lamp illuminates brightly. t₂–t₃: Crank slows visibly → lamp dims but remains lit. t₃–t₄: Crank stops completely → lamp extinguishes. All events occur from fixed frontal tabletop view; lamp and generator remain rigidly mounted; wire stays taut and unobstructed; no external light sources illuminate lamp interior.

Manual:
Experimental Procedure
1. Place hand-cranked generator and small transparent lamp side-by-side on a table.
2. Connect generator output terminals to lamp terminals using a visible insulated wire.
3. Person places hand on crank handle and rotates it manually: first fast, then slow, then stops completely.
Observation of Experimental Phenomena
- Lamp remains unlit when crank is stopped.
- Lamp lights up during rotation, appearing brighter during fast rotation than during slow rotation.
- Lamp glass is fully transparent; no opaque housing or diffuser visible.
Summary of Experimental Principles
A hand-cranked generator illuminates a bulb by manual rotation: mechanical energy from turning the crank induces electric current via electromagnetic induction, powering the lamp. Light output intensity depends on rotation speed — faster rotation yields higher voltage/current, increasing brightness.

Prompt Grounding rubric:
level_1: No hand-cranked generator visible, or no small transparent lamp visible, or no person visible, or no table visible in the shot: any one of these four core objects/entities missing entirely from the frame.
level_2: All four core objects appear on screen (person, hand-cranked generator, table, small transparent lamp), but no wire visibly connects the generator to the lamp, or the person's hand is not touching the crank handle, or the lamp sits away from the generator rather than on the same tabletop.
level_3: Person is seated or standing at the table with one hand gripping the crank handle at the start of the clip; the hand-cranked generator and the small transparent lamp both sit on the same tabletop; an insulated wire visibly runs from the generator's output terminals to the lamp's base.
level_4: Meets all 3-point criteria, and the crank handle is shown completing at least one full turn (a visible 360-degree sweep) during the clip, moving in one consistent rotational direction with no handle reversal or instantaneous jump in handle position.
level_5: Meets all 4-point criteria, and the crank handle passes through three visually distinct phases inside the clip: a fast-spinning phase (at least two full turns), a noticeably slower turning phase (at least a partial turn, clearly slower than the fast phase), and a full-stop phase (the handle stays motionless for at least one continuous second).

Scientific and Causal Correctness rubric:
level_1: The lamp never turns on anywhere in the clip, or it turns on while the crank is not moving, or it stays lit through the entire stop phase: the lamp's on/off state shows no dependence on whether the crank is turning.
level_2: The lamp turns on once and then stays at one constant brightness regardless of whether the crank later spins fast, spins slow, or stops; or the lamp flickers on and off in a pattern that does not track the crank's motion at all.
level_3: The lamp is lit during at least one of the rotation phases (fast or slow) and goes dark during the full-stop phase, so the lamp's on/off state tracks whether the crank is turning; no light source other than the lamp itself explains the lamp appearing lit (i.e., its illumination is not just ambient light reflecting off the glass).
level_4: Meets all 3-point criteria, and the lamp is visibly brighter during the fast-rotation phase than during the slow-rotation phase: a viewer can tell the two rotation speeds apart just from how brightly the lamp glows.
level_5: Meets all 4-point criteria, and the brightness tracks crank speed at every point in the clip with no exceptions: dark during the stop phase, dimly lit during the slow phase, brightly lit during the fast phase, with no moment where the lamp's brightness contradicts what the crank is doing at that time.

Spatiotemporal Consistency rubric:
level_1: The generator or the lamp jumps to a different spot on the table between frames; the crank handle skips instantly from one angle to a distant angle (e.g., it shows 90 degrees in one frame and 270 degrees in the next with no motion in between); the lamp strobes or blinks in a way that looks like a rendering glitch rather than a real power change; the tabletop itself visibly warps or breaks apart.
level_2: The crank handle repeats the exact same pose for three or more consecutive frames while supposedly turning, giving it a stuttering look; the shadow cast by the generator or lamp disappears and reappears with no change in the light source; the connecting wire visibly stretches, shrinks, or detaches and reattaches on its own.
level_3: The generator, lamp, and table stay in the same relative arrangement throughout: none of them drift, float, or sink into the table; the crank handle turns around a fixed axle with no side-to-side wobble; the wire stays taut and follows the same path between the generator and the lamp for the whole clip; cast shadows keep pointing in the same direction as the rest of the scene.
level_4: Meets all 3-point criteria, and the crank's rotation is continuous with no reversals or skipped angles, the lamp's brightness changes line up in time with the crank speeding up, slowing down, or stopping (the lamp does not visibly lag behind a speed change by more than a moment), and the whole sequence plays as one uninterrupted shot with no cuts or camera-angle changes.
level_5: Meets all 4-point criteria, and every spatial relationship stays physically stable for the full clip: the generator's base stays flush on the table with no rocking or lifting, the lamp's base does not vibrate or jitter, the person's arm and body posture stay consistent with someone actually turning a crank (no limb suddenly repositioning), and the room lighting stays constant with no wandering shadows from an unseen moving light source.