Electrical Energy
  * Electricity can be measured on scales of voltage, current, and power, which are related but different concepts.
  * Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit.
Topics

  * Electrical energy can be produced in a variety of ways.
  * Energy is a quantity that can be wasted, but never destroyed.
  * Voltage and current are different.
  * Energy can be transformed at different rates; this rate is known as power.
  * Alternating current can be transformed to higher or lower voltages.