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Why doesn't the led light battery turn on when it was turned upside down to negative?
Wiki User
∙ 10y ago
The old style 'incandescent' light bulb consists of only a skinny piece of wire
inside, that heats and glows when electric current flows through it. It doesn't
care which direction the current is flowing.
But the LED is a Light Emitting Diode ... an electronic component whose
two ends are not identical. One end of it is the 'cathode' and the other end
is the 'anode'. It's not important just now to know what those mean, just to
know that they're different. The LED wil light only if current is flowing through
it in one direction, and won't light at all if the current flows the other way ...
which is exactly what happens when you turn the battery around.
Wiki User
∙ 10y ago
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