A buildup of electrical charge causes static electricity. This discharge can produce lightning from a huge cloud called a(n) thundercloud. One hundred million lightbulbs can be powered by just one bolt. Lightning targets the shortest, clearest path. That’s why people use lightning rods to discharge lightning into the ground. Inside thunderclouds, particles rub together. At the top of the cloud, positive particles gather together. Heavy, negative particles settle at the bottom of the cloud. The ground stays positive relative to the clouds. Soon, with enough build up of charges, lightning strikes.