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    9V LED Circuit: Only One LED Lights Up

    Hi there, I'm an amateur when it comes to this so: I'm making a circuit with 2 6V LEDs in series with a 9V battery. Both LEDs are tested and work, but only one comes on when I connect the 9V battery. Does this mean I need a 12V to power both of them? I tried adding a second 9V to make 18V...
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