What is the approximate gauge of a wire that has a diameter of about 100 mils?

What was the understanding of elECtricity in the 18th century? Can you run a 110v heater on 220v circuit? Can I use a small DC electric motor as a generator to light up several LED's in a project? You have 480 volts coming into a stepdown transformer that is set for 440 volts incoming power would this cause your output voltage to be higher than 120 volts? What is a ceramic disc capacitor? What is the capacity of a 35mm2 cable? Can DC solar panels be located 100' from a house? What does 'dissipate' mean? What are the Limitation of conventional microwave tubes? What amp breaker do you need for a 325 watt heater 120 VAC? What should be the distance from electrical outlet from a water tank? Can a power surge make a air conditioner unit go out? If you use 6000 KWH a month of electricity how many watts would you have to generate? Who invented the eletro magnet? Why resistors are connected in series with the voltage source and in parallel with current source? Why do geographers use a grid system? What is the major difference between a high-speed and a high-torque drill? What is the difference between upstream and downstream in electrical network? Does the ground wire on a 200 amp box need to be 3 ought also? All of the following qualifications are mandatory for apprenticeships sponsored by the National Electrical Contractors Association and the International Brotherhood of Electrical Workers EXCEPT...?