Electrostatics

Electrostatics

1. LIKE CHARGES REPEL and UNLIKE charges ATTRACT

2. Charges are often transferred by FRICTION

3. The charge that GAINS electrons is NEGATIVELY charged and the one that LOOSES electrons has a POSITIVE charge

4. In electrostatics it is ONLY ELECTRONS THAT MOVE

5. Uses

   • Paint Spraying
     • The spray nozzle is connect to a POSITIVE TERMINAL
     • The frame that you are painting is connect to a NEGATIVE TERMINAL
     • As the droplets of paint will be positivly charged they attract to all parts of the uncovered surface of the frame. This allows for a "wrap around" affect for the paint. Once part is covered paint won't go there any more as they would be the same charge
   • Inkjet Printers
     • The ink droplet is negativly charged so will attract to the positive plate either side of it
       • These plates can change their charge very quickly which allows for the paint droplet to move position
   • Electrostatic precipitators
     • The first metal mesh is at - 50,000V and so makes the smoke particles negativly charged.
       • These then rise up and get attracted to the positivly charged metal plates. This gets rid of the dust particles