Electricity is an energy charge that flows through a conductor and was discovered by the Greeks 2000 years ago when they observed amber and fur rubbing together. There are three main types of electricity: static, current, and direct. Electricity travels from power grids through wide networks of wires connected to homes. Electricity is measured in amps, volts, and watts, and the cost depends on the amount used with rates of 9 cents or 8 cents per kWh depending if usage is below or above 3,000 kWh.