The equation V/R=A (where V=voltage-volts, R=Resistance-ohms, and A=Amperes-amp) can be used to figure the amps at a certain voltage and resistance.

If You short circuit a 9 volt battery (cross the two terminals) with a paperclip, then the voltage will be 9 volts and the resistance will be in the range of .1 ohms. Plug this into the equation and you will get 90amps, which can not be achieved by a current 9v battery! That means the battery will however reach its max possible amps, and cause the battery and the paperclip to get hot, and possibly damage the battery.

This amp rating is limited to the electrical current that the battery can store, and I don't think it would be able to store 90 amps at 9 volts. Here are the stats of real milli amp hour capacity of common alkaline batteries:

Aaa- 1150mAh

aa- 2850mAh

D- 18000mAh

9v- 595mAh

If You short circuit a 9 volt battery (cross the two terminals) with a paperclip, then the voltage will be 9 volts and the resistance will be in the range of .1 ohms. Plug this into the equation and you will get 90amps, which can not be achieved by a current 9v battery! That means the battery will however reach its max possible amps, and cause the battery and the paperclip to get hot, and possibly damage the battery.

This amp rating is limited to the electrical current that the battery can store, and I don't think it would be able to store 90 amps at 9 volts. Here are the stats of real milli amp hour capacity of common alkaline batteries:

Aaa- 1150mAh

aa- 2850mAh

D- 18000mAh

9v- 595mAh