spst relay, current?

One forgets the simple demonstrations! It reminds me of manually opening ignition points etc to clean them (with IGN on). But that is why any automotive accessory should have its own protection against such spikes - at least on its Power Supply (not it's inputs or outputs unless relays are intended). A good related test is to feel that spike at any distance from the coil/solenoid - I have felt relay spikes across the battery terminals (yeah - a battery is a BIG cap isn't it; does it seem stupid adding a tiny ceramic cap across it?).    But the simplest test tools are often the best. I thought Howie was referring to some nice CRO pic or something. But this demo method is so simple could have been easily published with an Audio dB meter reading. Reminds me of using the hand as a test for cable sizing. Or aging switches. (IE - heat.)

Yeah, my thumb is 0 gauge, and as for, let's not go there. Any one have a conversion table for US to Metric on wire gauges? I started out on the old Lucas/Ripaults stuff 14/28 where it meant current capacity/wire strands, now it's Metric everywhere bar the US and while I have no problems with spanner sizes, this stuff gives me problems. Mr. I how about wetting your fingers first? I got caught that way about 35 years ago, you don't forget it easily. Or stick a new PP3 battery to your tongue, I have a pal who tests the that way, what a masochist! What's a reactive load (simply please)? I thought that was a speaker or relay coil yes I know they are the same.

Those 9V batteries should be banned! A few years ago, they killed 3 people here in Aus. (That's how the stats reported it.) Maybe we need to lower the HV-DC definition? Think of the income for HVDC licence holders - car fuses, car audio, and fact any non-6V vehicle electrics! Geez - I'm so good for the recovering economy!