Voltage and Current


Direct current or DC electricity is the continuous movement of electrons from negative to positive through a conducting material such as a metal wire. A DC circuit is necessary to allow the current or steam of electrons to flow. In a circuit, the direction of the current is opposite the flow of electrons. DC electricity in a circuit consists of voltage, current and resistance. The flow of DC electricity is similar to the flow of water through a hose. Batteries and DC generators are the sources to create DC electricity.




  • Electrons can be motivated to flow through a conductor by a the same force manifested in static electricity.
  • Voltage is the measure of specific potential energy (potential energy per unit charge) between two locations. In layman's terms, it is the measure of "push" available to motivate electrons.
  • Voltage, as an expression of potential energy, is always relative between two locations, or points. Sometimes it is called a voltage "drop."
  • When a voltage source is connected to a circuit, the voltage will cause a uniform flow of electrons through that circuit called a current.
  • In a single (one loop) circuit, the amount current of current at any point is the same as the amount of current at any other point.
  • If a circuit containing a voltage source is broken, the full voltage of that source will appear across the points of the break.
  • The +/- orientation a voltage drop is called the polarity. It is also relative between two points.

A DC Theory quiz can be found at the following link and you must score a 75% in order to have mastered this topic.

 

http://Tutorial.quiz-creator.com/quiz.php?u232588q13553v-1512971216