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On a related note, I've driven that section of the M6 many many times and every time the sign board says M6 Toll Clear. Anyone know if this ever changes, even if the toll is congested, closed etc, or is it just a marketing tool to get you on there?

Fuses are not there to protect your appliances from your wiring but to protect your wiring from the appliances. If your tv for example failed and shorted out it would draw a big current. This blows the fuse. Without that safest valve it would instead heat up the wiring and quickly start a...

You are right that 24 watt on a 12 volt circuit draws a 2 amp current. You are also right that reducing the number by half should drop the power (and current) by 50% too. That is however on the assumption that they are run in parallel which I'm guessing they are. LEDs usually run in groups to...