When you wire a house you use wire thick enough that it won't have too much resistance, warm up and waste power as heat. But no so thick that it is too expensive. It's a compromise, as is the house voltage - too high a voltage, it's dangerous and you need thick insulation. Too low a voltage, you need thick wires. 120/240V is "just right" like the little bear's porridge.
The 12V battery would probably be OK. But when the car battery is charging when the car's running it can go to about 13-14V which would probably be bad for an alkaline or carbon battery.
Certainly if you then disconnected the car battery with the car running and just left your little battery, the charging voltage could rise to 30V or something and maybe blow up your little battery and probably your radio and engine control computer too.
You can buy "little 12V batteries" you plug into the cigar lighter socket to recharge the real battery. But those are lead-acid same as the car battery, so the charging voltage would not damage them.
Any appliance connected to the power outlet pulls power from it based on Ohm's Law.
A washing machine will not pull 15 amps continuously, It will pull that power required by the clock, relays, pump and motor as they switch on and off. Most of the time it is just The motor running but consumes high current when it enters the spin cycle as all of them are on at once and it is accelerating a heavy load up to speed and may consume UP-TO 15A.
Just for fun go to your meter and watch the meter measuring power for a few minute. then turn on the electric stove burners(4) and the oven. Now go look at The meter again. the consumption is much higher and you can get an idea of the power required to run that stove. Now shut them off and compute the power used in one minute. Look at your power company bill and compute the cost of the experiment.(pennies).
Your are wrong ! All devices has either resistance or impedance or both.
Most single house electricity current source is limited with a main fuse,like 100A or 200A.
A washer has its impedance while it was made, this impedance limits the current not more than 20A. As you house electricity has 100A, only 20A is used by the washer.
As you turn on more devices at the same time and suppose total current exceed 100A,fuse blows and no more power supplies to your house.
12V small battery hooks ( parallel ) to car 12.6V battery could blow up due to over charge by 12.6V .
Assuming that you have a typical home there is no reason to worry about the power. If you have a bunch of unusual high power stuff, then you may have a problem. Contact your power company. I wouldn't connect the small 12 volt battery to the car.
a fairly large House is reasonable if you need electrical power 20A 120V = > 2400Watt
200 watt of lamps, 350 watts of refrigerator, Air Conditioner 1500 watts, a rice coocker 250 Watts, etc.
okay i know that the electrical cables carry millions of kilovolts then the transformer converts it to a lower voltage to supply to homes 120V
lets say a washer requires like 20amps
im not sure of this
but how the heck does it get 20amps!
i know the washer gets like 240volts at the plug,so that must mean that the washer has almost no resistance
then you have a bunch of other things plugged into the house tvs microwaves things charging etc
then you have all the other homes the power plant has to supply to
idk maybe im just confusing my self
also if i have a small 12v battery like a regular 9v sized one
and i hoked it up to a car would the battery blow up?
