What is electricity caused by?
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Electrical energy is caused by moving particles that have a negative or positive charge. These charged particles are called electrons. The faster the electrons are moving, the more electrical energy they carry. Electrical energy commonly moves through a wire in an electrical circuit.
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Lightening strikes are caused by electricity. When air rubs together it causes friction, then the friction causes electricity, or lightening.
Instead of being purely a matter of physics, and a simple transfer of charged electrons from one material to another, it seemed static electricity could also be caused by chemistry (movement of ions and other essentially chemical processes). And it could also happen through a swapping of small amounts of actual material (a bit of balloon shifting to your pullover or vice versa).
By nature, electricity seeks to return to ground, and in a properly functioning circuit, this means that the current flows through the established wiring circuit back to the service panel, and onward back through the utility wires. However, if the connections within the wiring loosen or break, electrical current may "leak."