[scientizscht (OP)]

Hello

Cells have proton pumps which pump in/out protons. I assume this results at a pH change but does this also create a charge across the membrane? Or non-proton ions are only capable to create a charge?

Thanks!

[chris]

Yes; the proton pump on the mitochondrial membrane leads to a potential difference of about 0.2v across the membrane. The flow of protons down the concentration gradient through the ATPase drives creation of ATP.

[evan_au]

Similarly, sodium and potassium channels in the cell membrane also transport charged ions in and out of nerve cells.
This produces a time-varying voltage across the cell membrane in nerves and muscles.
See: https://simple.wikipedia.org/wiki/Nerve_impulse