5V + Ground = BAD?!

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hello,
recently bought arduino uno , interested in range of things capable of doing. followed tutorials , played led lights , moved on on more complex. followed tutorial connecting somekind of sensor had 3 pins: ground, 5v , pin arduino. connected ground , 5v arduino disconnected indicated went wrong..

any thoughts appreaciated . thanks!

if remove sensor arduino still power on?
maybe swap power pins.only detail how wire it.
one thing sure.powering correctly not damage arduino.


Arduino Forum > Using Arduino > General Electronics > 5V + Ground = BAD?!


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