4.

Know that electrical energy is the flow of electrons through electrical conductors that connect sources of electrical energy to points of use, including:<ul><li>electrical current paths through parallel and series circuits</li><li>production of electricity by fossil-fueled and nuclear power plants, wind generators, geothermal plants, and solar cells</li><li>use of electricity by appliances and equipment (e.g., calculators, hair dryers, light bulbs, motors).</li></ul>