A standard 15 amp or 20 amp plug is the same type you use at your house to plug in TVs, Stereos, Toasters, etc. These plugs are only designed to carry 15 to 20 amps of power depending if they are part of a 15 or 20 Amp electrical circuit. If you plug in too many appliances you will blow the 15 or 20 amp circuit breaker.
Most RVs are equipped with a 30 or 50 Amp electrical circuit and the plugs are different then your standard home electrical plug. This allows to you run more electrical appliances in your RV without blowing a circuit breaker. The 30 amp or 50 amp electrical systems are commonly found at RV resorts and campgrounds. Take a look at the answer I gave to the questions below to get further information. The first answer includes pictures of the plugs used in 30 or 50 amp RV electrical systems.
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