If it can be proven that you knew the items you pawned were stolen property you could be charged with Receiving Stolen Property (i.e.: being a 'fence'). If you pawned items that weren't yours, you MUST have known there was something fishy about it.
Yes
Theft is theft. Pawning what you stole doesn't really make any difference as far as you're concerned. The amount of jail time will depend on a number of factors, such as the value of the item and any mitigating or exacerbating factors. The simplest answer is "don't steal", that way you don't have to worry about it.
Stealing is a crime and can be punishable to jail time. The severity of jail time from a county jail or a state prison is based on what was stolen; corporate embezzlement will most likely be prison time.
it depends... how much money
Yes
probation and a fine possible jail time depend on priors and if you're already on probation.
6 yrs
They may not be any prison time depending on the item that was stolen and how it was stolen. Also depends on what state and if you have ever been charged with theft before or if this is your first offense.
Few months
This would depend on the state in which you live, but stealing electricity is typically charged as larceny and could net you several months in jail , or prison time. States typically will look at the dollar amount, ie >$5000 is a felony, etc.
20 years max
The punishment of stealing a car in Mexico varies. The sentence for theft in Mexico ranges from stiff fines to jail time.
Roman society today is subject to Italian law which, like most other countries, punishes stealing with time in prison or jail.