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Topic - Help with electricity/multimeter

Ben Sharp - on 08 Nov 2012
I've just put two screws into the base of a broken wooden lamp (to mend it), I'm sure they're no where near the wire but I'd be interested to know how to test it. I've glued it as well and will take the screws out once it's set but it occurred to me I wouldn't really know how to test it if I needed to so would be interested to find out.

Testing the resistance from a screw to each of the bulb pins and each of the plug pins in turn reads infinity (i.e. putting one needle on the screw and then alternately touching the parts mentioned, then repeating for the other screw). Does that mean there's no connection between the screw and the wire and is that enough to mean it's safe?
The voltage across the screws is 0 but then changes to 0.005V if it's plugged in and on. Why is this?


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