When you press the button, one side of each pair of electrodes becomes positively charged, and the other side becomes negatively charged.
(you; press; the button) (one side of each pair of electrodes; becomes positively charged; T:When you press the button) (the other side; becomes; negatively charged) (the other side; negatively charged; )
you one side of each pair of electrodes the other side the other side
press becomes positively charged becomes negatively charged
the button
T:When you press the button
negatively charged