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This model explains the principle of lightning, which is the visible discharge of electricity that occurs when a region within a cloud accumulates an excess of either positive or negative electrical charge, sufficient to overcome the air's natural resistance. Lightning is typically associated with cumulonimbus clouds. It occurs when distinct regions of positive and negative charge form within the cloud. Positive charge accumulates in the upper regions of the cloud, while negative charge builds up in the center, with a small amount of positive charge in the lower regions. These charges are carried by water drops, ice particles, or both. A lightning bolt is approximately five times hotter than the surface of the Sun. Globally, lightning flashes more than 3 million times a day, but not all strikes reach the ground; many occur between or within clouds. The energy released by an average lightning bolt is sufficient to power a 100-watt light bulb for more than three months. Lightning is also hazardous, killing about 2000 people annually.
