Corrosion (an oxide layer) on the reed surfaces can cause the switch to not "close" when contact is made. This problem happens often, especially on battery contact terminals. I often have to remove and rub battery contact points on my TV receiver remote control, for a similar reason.
Corrosion on a time-delay startup reed relay switch of my stereo system kept causing one of the channels to go out. It had to be removed and cleaned. It also happens on the RV stereo system. Turning up the volume helps "sap" the odide layer ans re-establish electrical contact.
My question is how does metal corrosion affect a reed switch?
This question is from my textbook. We are following cambridge igcse science.
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