The forming and breaking of a large electrical arc (lightning bolt) as a high-voltage disconnect switch is opened. For more info about what's going on and where and why it was filmed, see:
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Why does the arc grow, and why doesn't the current take the shortest-distance path?
The arc starts across the shortest path, but the ionized-plasma current-path heats up and rises. The ionized plasma has much lower resistance than the surrounding air so the current continues through the plasma.
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Many more video demonstrations of engineering and physics principles and devices can be found at:
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