To start, Let me introduce you to a component, a capacitor.
It has the ability to store power for a short period of time.
Here is a shocking experiment for you to prove it.
Take a 3V lithium cell and connect +ve to the +ve end of the capacitor, and the -ve end to the -ve end of the capacitor.
After a minute, disconnect it. Now take a kitchen knife (or a long metal piece that conducts electricity.
Now take the capacitor, put the first lead (connection point) on the knife, and the moment the second lead touches the knife, you will see a spark.
Basically, the capacitor acts as a battery, and you are shorting it. Every minute that it is shorted is every minute it loses power. So you need to repeat the entire process if you want another spark.
For more power, replace 3V with 9V. For beginners, I don't recommend higher than 3, because anything too high can be harmful to the body.
Also, the above steps can deliver alot of current (at least in amps).