What is electric discharge?Under what condition it occurs?

electric discharge in simple words is knwn as lightening!
i hope u now y lightening occurs!
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Though air is an insulator, it still allows the passage of current through it if the quantity of charge is large and the distance is small. In such a situation, very heavy charge passes through the air in a very short time. Normally this is accompanied by heat and light. This is called Electric Discharge. 
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Though air is an insulator, it still allows the passage of current through it if the quantity of charge is large and the distance is small. In such a situation, very heavy charge passes through the air in a very short time. Normally this is accompanied by heat and light. This is called Electric Discharge.
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A very heavy charge passes through the air in a very short time normally this accompanied by heat and light. This is called electric discharge
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