Originally Posted by Sundance
New to this and I have a 73' Argosy 26 footer.
I have seen some campground ads that have variable Amp hookup site for varying costs. Like 30 to 50 amps is $30/nite down to 20 amps for $20/nite. One I saw even had a 15 amp site.
What kind of amps is needed for fridge and A/C??
Since no one has answer your question directly by defining it, I will try to compare it to something you can visualize such as plumbing. It goes as follows;
Voltage= Line pressure. Voltage can be DC [Direct current] or AC [Alternating current]. Direct current can be compared to constant line pressure. 12 Volt
can be viewed as 12 Lbs of pressure, but it can be DC [constant] such as provided by battery which is nothing more than pressurized storage container, or AC [alternating]. Alternating current is measured in cycling rate which can vary in accordance to need. Our household cycling rate is generated at 60 Cycles [Pulses] per second at the pressure of 120 Volts. This means that the current in the wire is there at 120 Volts only sixty times per second. The other sixty times is at O volt [pressure] and in between those times, the pressure either falls or rises between those limits. European cycling rate is different. It is at 240 Volts of [pressure] and at 40 pulses[Cycles] per second. This is why we need a converter to run our equipment in Europe.
Amperage= Can be compared to Volume of flow. The bigger the pipe the higher volume of flow. The more work the piece of equipment performs, the more Volume it needs to perform such task. In this case you need bigger diameter wire [pipe] to get more flow into it. Required amperage is listed on every appliance label.
Last issue is the Resistance which is measured in OHMS. Conductivity of the wire is rated by level of nobility of the metal from which the wire is made of.
This depends on Atomic structure of given metal which is measured in ratio of free to bound electrons. Balanced Atom will have equal number of Electrons and Protons within its Atomic structure. Bound electrons are bound within the Atomic structure and cannot flow freely. Since the current is flow depended on the flow of free electrons within the wire, the bound electrons create a resistance to free flowing electrons which bombard the stationery [bound] electrons. The higher the number of bound electrons the higher Resistance within the wire. For instance;
Aluminum- has 3 bound electrons to every 10 free.
Copper- has 1 bound to every 28 free
Silver - has 1 bound to every 46 free.
Bound electrons act much as a rust or debris within the pipe.
Therefore; Volt is a unit measure in the difference between the charges, known as the unit of pressure.
Ampere- Number or Volume of Electrons moving through the conductor [wire].
OHM- Unit of Resistance that results from the collision of Protons and Electrons with bound Electrons. Much like rust and debris within the pipe can slow down the flow.I hope that explains in some way what you were asking. Thanks, "Boatdoc"