(19-05-2021, 01:52 PM)Chris KC Wrote: n.b. I don't know the first thing about electricity - these are crib notes I have stored against the day when I might want to do it myself! You will find video clips on youtube if you search.
I do Chris!
You are perfectly right. A capacitor has an infinite resistance in DC (Not in AC of course). The ohmmeter (DC) charges it when trying to measure that infinite resistance. When reversing the wires the ohmmeter sees a discharge current and finally zero current again hence infinite resistance.
Some testers, even cheap ones can measure the capacity. But your stored method is perfectly enough and valid for our purposes.
About capacitors, modern ceramic (chips) ones should be used now when possible because much better than old style.