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An average bolt of negative lightning carries a current of 40 kA (kiloampreas) although some bolts can be up to 120 kA, and transfers a charge of 5 coulumbs and 500 MJ (megajoules)or enough energy to power a 100 watt lightbulb for just under two months. The voltage depends on the length of the bolt: with the of air being 3 million volts per meter, this works out at about one billion volts for a 300m (1,000 feet) lightning bolt.