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Can I install 200 amp panel using 200 amp meter?
yes The meter rating is the maximum, if you use it on a smaller service that is OK from a code point of view. However, the local utility company may also have special rules about which meters pans can be used on which type installations. You may need to check with them
How do you know what size ground wire to use on a 200 amp service?
NEC code requires #6 bare copper.
What is the correct wire size to install with a distance of 200 feet for a 100 amp single phase underground service?
This is a voltage drop question. A #1 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 200 feet on a 240 volt system. Or a 3/0 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 200 feet on a 120 volt system. In your question you sis not stipulate what the working voltage is.
Which is bigger resistance 20 ohm or 200 ohm?
200 ohm
If you had a 200 ohm resistor with a silver fourth band what would it's maximum value be?
The fourth band indicates the tolerance. Silver is ±10%. Thus, (200 + 0.1*200) = 220 ohms. The minimum, then is (200 - 0.1*200) = 180 ohms. See link.
