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Question:

why cant you run a ac motor on batterys? its all electricity what if i stack the batterys?

not asking for a inverter

Answer:

You can. Just go buy an inverter. Connect the inverter between the DC battery and the AC motor. Voila.
Even an auto takes electricity. Water runs with neither.
Err, no, it's not all electricity - there are lots of different types of electricity - or perhaps I should say electrical currents, to be more precise. You have probably heard of the abbreviations A.C. and D.C. used in connection with electricity. They stand for alternating current and direct current. The former changes its flow direction at a rate of between 50 and 60 times per second (depending where you live in the world). The latter always sends the current 'one way' That's why you cannot run A.C. only devices from a D.C source. Moreover, trying to do it is highly likely to damage the device (at best); cause a serious fire (at worst) plus the possibility of an electrical shock, if the insulation fails due to the excessive heat being generated within the device. .
Hi Michael; Batteries produce Direct Current (DC) where the motor you speak of requires Alternating Current (AC). No matter how many batteries you stack together, the motor will not run. To use batteries to make the AC motor run, you would need a converter to convert the DC current to AC current. Hope this helps!
The AC stands for Alternating Current where the current flows one way through the wires and then flows the other way through the wires. If it does this 60 times every second, it's called 60 Hertz (Hz) or 60-cycle AC. This is what comes out of the wall outlet in America at 110-120 volts and 220-240 volts (or more). The DC stands for Direct Current and only flows in one direction. This is what you get from a battery. Batteries are marked with + and - symbols indicating plus and minus and are indicative of which way the current will flow when you hook it up to a load. AC motors depend on the fact that the current flows one way and then back the other way. It is this back and forth flow that drives the motor 'round and 'round due to the arrangement of the coils inside the motor. DC motors use magnets and a switching commutator to change the direction of the current internally to achieve a similar result to the AC motor (i.e., it also goes 'round and 'round). As a result, you can't run an AC motor on a battery unless you use it to drive something that produces the alternating current for you (i.e., an inverter). (Note that AC motors and DC motors perform differently under a load since each is fundamentally powered in a different fashion -- DC motors have the most power at the lower speeds whereas AC motors have maximum power at some RPM determined, in part, by the number of AC cycles per second)

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