Amp hours refers to the amount of electrical charge the battery can product in an hour, while voltage determines (in part) the power output of the battery.
Most e-bikes and e-scooters will have lithium-ion batteries.
In the UK, the maximum legal power output of an e-bike for use on public roads and footpaths is 250W.
The higher the torque, the easier it will feel when pedalling.
Anything over 30nm is more than sufficient!
Cycling in a lower gear means less pedalling effort and less speed.
Cycling in a higher gear means more pedalling effort and more speed.
Most e-bikes will come with 7 or 8 gears.