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I have three different breadboards with ten LEDs & resistors connected in parallel.
All three are powered by a 9v battery.

I was wondering if there would be a way to wire all three batteries to a single switch so I could turn everything?

Here's the breadboard diagram: enter image description here

Thanks!

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  • \$\begingroup\$ you said that all three are powered by only one battery .... do you mean that each one is powered by a separate battery \$\endgroup\$
    – jsotola
    Feb 26, 2020 at 4:00

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If you have a common ground, you could put the switch between the battery grounds and the breadboard grounds. If not, you probably need a 3-pole switch.

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  • \$\begingroup\$ I've succeeded with wiring a switch to each breadboard & battery. I was wondering if there would be a way to connect all three breadboards / corresponding batteries to a single switch. Would I be able to do this with a 3-pole? \$\endgroup\$
    – CK209
    Feb 25, 2020 at 17:01
  • \$\begingroup\$ Yes, if the common ground doesn't work for you. A 3-pole switch is essentially 3 switches working off the same button/handle. \$\endgroup\$
    – Cristobol Polychronopolis
    Feb 25, 2020 at 17:07

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