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This is a common mistake that comes about because it was thought that electricity flowed from positive to negative. We now know that it is actually electrons flowing from negative to positive. The positive terminal still has to be the larger one to catch all the loose electrons.
You can test this theory yourself, the nozzle on the end of the garden hose is about 1/4'' diameter where the water comes out, but you need a much bigger area to catch the water that has come out.
If you are using AC fuses on a DC circuit you should take them out and reverse them once a week.
Graham
You've all got it wrong. Lectricity is made of smoke not electrons and all that guff. When a circuit fails it releases the smoke and doesn't work so you have to replace these little canisters. The manufacturers call them capacitors so we think it is hard to make them.
The other thing people always forget is , like water, electricity can't flow upwards. Which is why batteries are always up high in the engine bay to gravity feed everything.
You've all got it wrong. Lectricity is made of smoke not electrons and all that guff. When a circuit fails it releases the smoke and doesn't work so you have to replace these little canisters. The manufacturers call them capacitors so we think it is hard to make them.
There is special blue smoke that is used in Lucas auto electrics, it is much harder to keep contained that is why they have so many failures.
Does this mean I should stop calling those canisters condensers?
Graham
The other thing people always forget is , like water, electricity can't flow upwards. Which is why batteries are always up high in the engine bay to gravity feed everything.
Damn! I'm getting the best education I've ever got about electrickery from here.