Because a battery works by the chemical action of the electrolyte on the plates. The process works slowly, and it works with a constant potential, which is inherently DC.
An AC-DC converter you can operate a device on AC instead of batteries. ~bobbyjack~ : D
It allows you to use mains power instead of batteries
Batteries store DC, or Direct Current. The correct term for AC is Alternating Current.
dc
Because batteries have fixed polarity, whereas AC requires that the polarity is switched, normally 50-60 times per second.
Batteries are storing charge or free electrons. The state is by nature a fixed voltage rather than a varying voltage. You can convert the battery charge to AC by using what is called an inverter.
"dc" is direct current which is what batteries use, whereas "ac" is alternating current, which is what your household receptacle uses.
Batteries are DC
No. AA batteries are DC to begin with. The equipment in question may have an AC power jack, though.
No, the AC adapter for the original Game Boy does not charge the device; it simply provides power to run the Game Boy while plugged in. The original Game Boy uses four AA batteries for power, and there is no internal battery to charge. Instead, the AC adapter allows for extended playtime without needing to replace batteries.
DC definitely, all car batteries - all batteries.
Yes, by using a dynamo (which produces d.c.) instead of an alternator.