This seems like a question from an electrical course, and is probably best answered by your course materials.
It's your test question, not ours, and there won't always be someone else to ask for the answer. Earn your diploma.
processor
To use an electrical tester effectively and safely, first ensure the tester is in good condition and suitable for the type of electrical work you are doing. Always turn off the power before testing, and follow the manufacturer's instructions carefully. Use the tester to check for voltage, continuity, and proper wiring. Be cautious and wear appropriate protective gear to prevent electrical shocks.
If you are legally getting paid, than yes. If you are doing it for free, than no.
Listening
When doing a controlled experiment, you get accurate results.
Yes, Kinkos does digital printing. You can go to a Kinkos store and ask them the details for doing such printing, as I have never done it there before.
An error has occurred (with the holder that you place the tester stick in). Mine did this too, I think it's because I didn't insert it into the holder properly. Make it's firmly place in before doing the test or that'll be another £5 gone!
I would take a 12V tester ( $6) and test the circuits; if the tester lights up after the fuse, the fuse is good and doing it's job. Mark
A controlled variable is the thing that is kept consistent in between trials of doing an experiment. e.g: time is kept the same or kept consistent...
evolutionary biologist
Front office that is doing all kinds of work controlled by front office.
No , computer controlled