Never put metal silverware into plugged in toasters. This path is called a circuit. Electricity flows only when it completes a circuit. Current is a number of electrons flowing in a steady stream through a material. In comparing electricity to water, the amount of current carried by a power line would be the same as the volume of water in a water line.
Some materials conduct electricity and others block it.
Materials that allow electric current to flow are called Conductors. Aluminum, brass, copper, silver, gold and water make good conductors. Materials that do not conduct electricity are insulators or non-conductors. Glass, rubber, and plastics are good insulators. Electricity flows only when the circuit is complete.