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Power or energy cannot be measured in volts. The only thing you can say is one - the 9 volt battery - has a higher voltage than the other, the 6 volt battery. If you are asking about the power or energy contained in a battery, then the amount iof energy it can supply depends mostly on its physical size that is determined by the battery "type".
A "D-size" carbon-zinc cell at 100 mA would have about ten times as much "energy" as a 9V carbon-zinc at 8mA. A battery in the AAA series would have about the same energy as a 9V, which should not be surprising since a D is 10 time larger than a AAA.
When using the Inverter the CCU can be adapted to the users needs. A regular 12 volt battery would work on any small devices.
If there is nothing else in the circuit, then the voltage drop across the resistor will be the full supply voltage of 5 volts. The size of the resistor does not matter in this case - it will always be 5 volts.
Running a 9 volt Motor on a 12 volt BatteryUsually, I have gotten away with this, BUT... depending on the quality of the windings in the motor, it could burn through the tiny wire in the motor winding. I have done this many times with no problem, but have also burned out a few motors.One good example is that I have several [from the "early" days] cordless drills. The early ones used anywhere from 6 to 9 volt battery packs.I then bought a 12 volt drill at Harbor Freight and Tools, and when I got it home and examined it I realized that the 12 volt battery pack was IDENTICAL in size to the older 6 and 9 volt packs.So, after charging the new 12 volt pack, I tried it in the older 6 and 9 volt drills. Lo and behold, it worked fine, with just a little more RPM and drilling power.I then called my Electrical Engineer brother and asked him about it and he said that those small drill motors are not that sensitive to even a doubling of voltage and perform OK with 12 volts on 6 and 9 volt units.That was about 4 or 5 years ago, and for some time, I've been using 12 volt battery packs for all three units [6, 9, and 12 volts]. When time came to replace failed 6 and 9 volt units, I switched to 12 volt packs for all 3 drills.Again, I think 12 volts will be safe for your 9 volt motor, but it depends on the motor.
60 Hertz is the frequency that the welder should be connected to, to work as it is designed to.
4 copper
On a 120/240 volt distribution the neutral is sized along with the supply conductors. The sizing is based on the amperage of the service distribution.
Should be a 12 volt battery.
No, unless you can set it low and can be assured that it wont use more than say 4000watts, the welder might momentarily use more power than what you set it to, it should not wreck the welder i would imagine unless it is a fancy mig welder or something, set the welder low you should be fine but for high end use she should be firing out 8 or 9kw so keep it low if you must.
Check the nameplate on the welder, if the voltage that runs the welder is 240 volts then the two black wires connect to a 240 volt supply and the green wire connects to the ground of the supply.
No, unless it is dual rated for 110 - 220 volt use. Check the manual or look at the rating sticker that should be somewhere on the printer.
The generator should be about ¾ hp.
No. A 120 volt 15 amp service will handle a maximum of 1,800 watts. Even a 20 amp service will only handle 2400 watts and that is at max load which you should never load on a 20 amp circuit. You will need a 30 amp 120 volt or 240 volt service for 2400 watts.
It depends on the physical size. The capacity should be marked on the case.
On a 230-volt circuit, the cable should be suitable for 13 amps. The size is 1.25 mm2 or 1.5 mm2.
Not in the US of A.