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Jacob's Ladder

Electromagnetism

★Exhibit Content: Jacob's Ladder ★Interaction: Electromechanical Interaction ★Operation: Step up to the exhibit and press the button to observe the arc movement between the horn-shaped electrodes. ★Exhibit Description: The exhibit consists of a transformer, two horn-shaped electrodes that are narrow at the bottom and wide at the top, and other components. When activated, a strong arc discharge occurs between the two horn-shaped electrodes, producing a high-temperature, dazzling electric arc. Driven by air convection and electrodynamic force, the arc rises. As the arc is stretched, the resistance through the arc increases. When the energy supplied to the arc by the current is less than the heat dissipated from the arc path to the surrounding air, the arc will extinguish automatically. At this point, a new arc will form at the bottom of the horn-shaped electrodes, creating a repeating phenomenon of an arc climbing ladder. The exhibit is equipped with a ventilation device to replace the air inside the protective cover during demonstration intervals, preventing excessive concentration of ionized air. ★Scientific Principle: The exhibit consists of a base, electrodes, a transparent protective cover, a high-voltage generator, etc. When the visitor presses the "Start" button, high voltage is generated between the electrodes, forming the Jacob's Ladder discharge phenomenon. The Jacob's Ladder model is a pair of electrodes that are wide at the top and narrow at the bottom. Under a high voltage of 20,000 to 50,000 volts, the air at the closest point between the two electrodes is first ionized and broken down, forming a large number of positive and negative plasmas, i.e., generating an arc discharge. Driven by air convection and electrodynamic force, the arc rises. As the arc lengthens, the resistance through the arc increases. When the energy supplied to the arc by the current is less than the heat dissipated from the arc path to the surrounding air, the arc will extinguish by itself. Under high voltage, the air at the point of minimum distance between the electrodes will be broken down again, causing a second arc discharge, and this cycle repeats.

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Principle Display: ★★★★★ Interaction Effect: ★★★ Ease of Installation: ★★★★ Durability: ★★★★ Overall Rating: ★★★★

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