it is the type of circuit involved eg 120V vs 12V. any electrical device requires one thing – electrons. the battery is one means of doing this but not very efficient because they continually need to be recharged. Electricity is created at power stations which provide ample electrons to power your devices.
If you wanted to run off a battery you could do so by using an inverter. the inverter would convert the 12V battery source to 120V circuit that your typical appliance runs off of. This would not be very practical unless you have alternative energy source such as windmills and/or solar panels. Batteries must be deep cycle to do this because regular batteries are not meant to be discharged and recharged so much.
Higher voltage is more efficient and why the power company uses high volts / low amps. To get the watts you take the volts x the amps. Example 120V * 10 amps = 1200 Watts or 12V * 100 amps = 1200 watts. So for a battery you will have a higher amp draw but in the end it will come down to electrons which drive all electronics devices.
Tesla created free energy but his concepts were buried and power companies have it engineered so you will be better off using them. The secrete lies within the electron.. A little particle that travels in between conductors such as copper. In essence these conductors are like batteries that hold electrons – when an abundance of electrons are available they will push (force) each other (leave behind an open hole (orbit in the atom) which are replaced by the new electrons and that is your current flow. You see a good conductor already has electrons and they will push each other out of orbit and go to where the draw is. I know much too complicated for your simple question but that’s how I provide answers! Hopefully to evolve our primitive science.
A little gift to mankind .
on: 10th February 12