1. They don't "always" insist on working on live circuits. Sometimes they feel confident enough that they don't want to take the trouble; but it's never a good idea. Just as any trade dealing with hazardous conditions, people often become complacent, and push the rules of safety.
2. Not all electricians work on live circuits unnecessarily.
No. Parallel circuits are not fuses. Fuses can be used to protect parallel circuits.
Would be a good idea you prick
Missouri does not have state-wide licensing standards for electricians. Instead, it is left to the individual counties and municipalities to establish standards. St. Charles County, for example, only licenses experienced electricians who have passed the Master Electrician Exam from the ICC: http://www.iccsafe.org/Accreditation/Pages/default.aspx In your city/town, check with the Mayor's office to find out which agency licenses electricians and proceed from there.
Actually either can be used.
Instead of blowing a fuse you'll blow up a light bulb if there is a surge.
Smaller Longer Lifespan/More reliable Less power used
Modern devices use integrated circuits instead of vacuum tubes because integrated circuits occupy less space than vacuum tubes, are more efficient, consumes less energy and are more reliable than vacuum tubes.
you need a transformer (instead of rewiring) from 220v to 110v The above answer will work but it is not correct. All lighting fixtures installed in Canada have to be CSA certified. If you really like the design of the lamp then you could consider rewiring it with certified CSA components You can buy replacement lamp parts at any DIY outlet. Change out the lamp cord and plug end along with the lamp (bulb) holder and you will have a certified fixture.
Integrated circuits consume less power, are smaller, can be more complex in a much smaller space and are cheaper to make for similar functions than vacuum tubes.
The components are not connected directly across the power supply. Instead they are 'daisy chained', the output of one leads into the input of the next.
Because if it were something else you'd be asking why it is that instead of what it is.
Time instead (of) something.