What is discharge ans?

Answer 1

When something has a buildup of net charge, getting rid of that charge is "discharging" it. For example, two metal plates near each other, but not touching (called a capacitor) will build up equal and opposite amounts of charge when connected to a battery. When the battery is disconnected the plate charges will remain. You can discharge the plates by placing a conductor (metal object) across the two plates. The chages aren't destroyed, just allowed to move from one plate to the other so the number of positive & negative charge on each plate is equal and resulting in no net charge buildup. Sometimes the charge buildup is large enough that it will discharge thru the air and you see it as a spark.