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What would happen if I used a 5v charger to power a 3v led? Answered

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janw

8 years ago

It will light up shortely and then die forever.

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caarntedd

8 years ago

If you don' tconnect a current limiting resistor in series with the LED, you will get smashed in the face by high pressure water. 

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AndyGadget

8 years ago

What would happen if you put your face right in front of a fire-hydrant and turned it on to get a drink?  
Attach the same water supply to a drinking fountain and you'd do much better.  The drinking fountain limits the flow of water.

Put a 180R resistor in series with the LED and harmony will be restored.

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nickodemus

8 years ago

When I had the bright idea to attach a 1.5v to a 9v battery (who knows why...), it lit very brightly for about a second, then it burned out.

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sky0

8 years ago

It would shatter. In my workshop a 9v battery brushed against a 1.5v led and the thing exploded. Plastic shards everywhere. My recommendation: don't do it.

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steveastrouk

8 years ago

Without a current limiting resistor the power supply will be damaged by the burning LED/