Domain: Natural Science — Physics
Target concept: Slide resistor

Video generation prompt: A battery power supply, an LED lamp, a sliding resistor, and a single-pole switch are connected in series on the table to form a closed circuit. Close the single-pole switch to make the LED lamp emit light, and gradually increase the resistance by adjusting the sliding resistor.

Evaluation guide:
(i) Target concept: Current-dependent luminance in a series resistive circuit with fixed voltage supply.
Minimum mechanism: Closed-loop conductive path exists; switch controls circuit continuity; sliding resistor provides variable series resistance; LED is a current-driven semiconductor device with fixed forward voltage drop and monotonic luminance–current response.
(ii)Storyline: [Frame 0–t1] Switch open → LED unlit; all components stationary and fully visible in fixed tabletop view. [t1–t2] Switch lever rotates fully to closed position → LED appears lit with stable color and initial brightness. [t2–t3] Slider begins moving linearly along resistor track → LED brightness initiates continuous, unbroken decrease. [t3–t4] Slider reaches high-resistance position → LED maintains dim but clearly visible glow, same color. All transitions occur within single continuous shot; no occlusion; lighting and perspective invariant; causal chain is strictly sequential: switch closure → illumination → slider motion → dimming.

Manual:
Experimental Procedure
1. Place battery, single-pole switch, LED lamp, and sliding resistor in a straight line on table.
2. Connect them sequentially with wires to form a closed series circuit.
3. Keep switch open initially; close it to complete circuit and light LED.
4. While LED is lit, gradually slide resistor"s contact to increase resistance.
Observation of Experimental Phenomena
- LED is unlit when switch is open.
- LED lights up immediately upon switch closure.
- LED brightness decreases continuously and visibly as slider moves toward higher-resistance end.
- LED remains lit (does not extinguish) at all resistance settings shown.
- LED color remains unchanged throughout.
Summary of Experimental Principles
- In a series circuit, current is uniform; increasing total resistance reduces current (Ohm"s Law: I = V/R).
- LED brightness is proportional to current flowing through it.

Prompt Grounding rubric:
level_1: None of the four required components (battery, LED lamp, sliding resistor, single-pole switch) is clearly visible; or two or more of them are missing; or the objects shown are not arranged as a single series loop on a tabletop.
level_2: All four components (battery, LED lamp, sliding resistor, single-pole switch) are present on the tabletop, but at least one is wrong or unusable in context: for example the LED is drawn as an ordinary incandescent bulb, the switch floats without any visible mounting, or the resistor sits apart from the wiring path so a series connection is not physically possible.
level_3: All four components are present, correctly shaped, and laid out in a line on the tabletop consistent with a series circuit; visible wires connect battery to switch to LED to sliding resistor and back to the battery in a single unbroken loop; no extra branches, batteries, or LEDs appear.
level_4: Everything required at the 3-point level is present, and in addition: the switch starts open at the beginning of the clip and is visibly toggled closed during the clip; and the slider starts near the low-resistance end of its track and is visibly moved toward the high-resistance end during the clip.
level_5: Everything required at the 4-point level is present, and in addition: the slider only begins moving after the switch has already been closed; the wiring stays fully visible and intact for the whole clip; and no component is occluded, swapped, or replaced by an edit that breaks the sense of a single continuous circuit.

Scientific and Causal Correctness rubric:
level_1: The LED never lights up at any point in the clip; or the LED is already glowing before the switch is closed; or the LED's brightness changes while the slider is not moving; or the LED gets brighter (rather than dimmer) as the slider moves toward the high-resistance end.
level_2: The LED lights only after the switch closes, but its brightness does not visibly respond to the slider moving; or brightness changes occur with no corresponding slider motion; or the LED goes completely dark partway through the slider's travel and never recovers, even though the slider has not yet reached its far high-resistance end and the circuit is still closed; or the LED's hue visibly shifts (e.g., red to green) as the slider moves.
level_3: The LED stays dark while the switch is open, turns on as soon as the switch closes, and then dims continuously and monotonically as the slider moves toward the high-resistance end; the LED stays visibly glowing (never goes fully dark) across the whole range of slider motion shown; its hue stays the same throughout, whatever color it starts as.
level_4: Everything required at the 3-point level holds, and in addition: the dimming looks smooth rather than stepped or flickering; brightness never rebounds or plateaus for an extended stretch while the slider keeps moving in the same direction; and at the slider's final high-resistance position the LED is dim but still clearly glowing, not fully extinguished.
level_5: Everything required at the 4-point level holds, and in addition: the brightness only starts falling once the slider begins moving, with no dimming beforehand and no noticeable delay after; the pace of dimming tracks the slider's direction of travel, never reversing while the slider continues toward higher resistance; and the LED's hue, shape, and on-state stay fixed: only its brightness changes.

Spatiotemporal Consistency rubric:
level_1: The switch, slider, or a wire jumps to a new position between shots with no motion connecting the two positions; or the LED or resistor changes size or orientation abruptly with nothing shown in between; or a wire visibly detaches or reattaches without any hand or tool touching it; or the tabletop surface shows a visible seam, warp, or texture break partway through the clip; or the lighting on the tabletop suddenly switches between bright and dark (or the shadows flip direction) with no camera or hand movement to explain it.
level_2: The slider's travel along the resistor looks jerky or skips positions rather than moving smoothly; or a wire end appears to float unsupported; or the resistor appears to rotate as a rigid block with no visible pivot or hand causing it; or the camera view pans, zooms, or tilts even though the scene should be one fixed tabletop shot; or the shadows cast by the components on the tabletop flicker or shift direction inconsistently between frames with no change in the room's lighting.
level_3: The battery, LED, resistor, switch, and wires keep the same size, orientation, and position relative to each other for the whole clip; any hand shown moving the switch or slider does so smoothly and plausibly; the slider moves along its track without jumping sideways or spinning; wires stay attached with believable sag; the camera never cuts or changes viewpoint; and no component flickers or turns translucent unexpectedly.
level_4: Everything required at the 3-point level holds, and in addition: the slider's motion stays on its track with no lifting off or sideways drift; the hand actions of closing the switch and moving the slider are clearly separated rather than overlapping in a confusing way; and the LED's on/off state is legible in every frame where it should be lit, not hidden by blur.
level_5: Everything required at the 4-point level holds, and in addition: the slider advances toward the high-resistance end with no visible backward jump or freeze; the switch lever's rotation from open to closed reads as one continuous mechanical motion rather than a jump-cut; and no part of the circuit (wires, battery, LED, or resistor body) flickers, warps, or briefly duplicates at any point.