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It depends on the flashlight.

  • Old style lights with incandescent bulbs will light regardless of the direction the current flows. The problem is that misinstalled batteries may not contact the connectors properly and no current flows.
  • For modern LED lights the current must flow in the proper direction due to the nature of diodes so the batteries must be installed correctly. This applies for many diode and transistor using systems such as wireless keyboards and mice.

It would.of course, be more interesting if backward installed batteries caused the flashlight to suck in light and cast a beam of darkness - but the real world does not work in this way


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10y ago

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