D1 and D2

• Electrical discharge


  Unbalanced charge between 2 objects "shocking"
• The only way an electrical current can be produced

  If there is a steady flow of charged particles
• Millivolt


  1/1000 of a volt
• Why can a rechargeable battery be recharged?

  Chemical reactions can be reversed
• Laws of charges


  1. Like charges repel

  2. Opposite charges attract

  3. Neutral object and charged will attract
• Static electricity


  The result of an imbalance between negative and positive charges in an object
• Current electricity


  A flow of charged particles moving through a conductor or space
• Voltage


  Potential difference expressed in votels
• Safety precautions to be aware of when working with electricity

  - Stay away from water

  - Don't used damage wires or broken cords
• Conductors


  Materials that allow electrons to move freely ex.) Copper, gold
• Insulators


  Materials that resist the flow of electrons ex.) Paper, wood
• Piezoelectric effect


  Apply pressure to the crystal and it will create a current
• Thermocouple


  A device that converts thermal energy into electrical energy
• The amount of resistance depends on:


  - Type of material

  - Temperature

  - Diameter of the wire

  - Length of the wire