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Incandescent lights act as basically a dead short until the tungsten element heats up. They have the worst inrush current. That's why the voltage sags a little when the lights turn on. On the other end, cutting off the lights creates a little bit of back EMF. In the electricity-to-plumbing conceptual conversion, back EMF is like water hammer. Cutting off the current (flow) quickly causes the voltage (pressure) to spike. I wouldn't sweat too much the needle jumping like that. Old electrical systems were not designed to account for these things. Instead they filled the gauges with grease so they didn't jump.
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Mar 29, 2022 03:53
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| # ¿ May 17, 2024 00:42 |
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