yes, you can.
The cord your after is a 6V-DC/500MA adaptor.On the York website, you can find out the part number for the adaptor you need.You can find more information at the posted link. However, it may be easier just to head in to a local electronics store and ask about a 6V/500MA DC Adaptor - they should be able to help you out.
It is: -10v+6v = -4v
Most probably you are using a AC (117V or 220V) to DC 6V converter adapter. If yes, then the answer is no, you cannot use a lower current rating for a device that draws more current. If you plug in a device that needs DC 6V 500 mA to an adapter that can only supply DC 6V 300mA, then the adapter could start sending higher than 6 volts current which may damage your equipment or overheat the adapter. If you are using a higher mA rating adapter, then it's okay. For more technical details, see: http://www.jaycar.com.au/images_uploaded/plugpack.pdf
no
Yes you can. All the 1300 mA rating means is that adaptor can supply devices up to 1300 mA. The old adaptor's limit was 800 mA. The new adapter has 500 mA more in reserve if it is ever needed.
No you should not do that. It will damage the battery and the battery will explode.
0
If the machine is designed to run on 6v and you use two 6v batteries instead of one, then . . . -- If you connect the two batteries in parallel, then they will last twice as long between recharges as one battery does. -- If you connect the batteries in series, then they will definitely overheat the motor, and possibly destroy it.
6 and 18v, respectively.
Yes you can. Given the fact you're talking about milliamps - the slight increase in amps will have no detrimental effect.
2u^2-6v-uv
5(6v + 7)(6v - 7)