Electrical safety
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Transcript

  • 1. Electrical Safety
  • 2. Electrical Fundamentals Electrical Saftey
  • 3. Danger Tag
  • 4. Eye Protection
  • 5. Operating Welder
  • 6. Unapproved Sign
  • 7. E LE CT RICAL SAF E T Y
  • 8. ELECTRICITY • Energy in the form of released or moving electrons • All atoms have electrons - some release easier than others
  • 9. VOLTAGE • Potential that exists as the result of a substance’s ability to release electrons • an ELECTROMOTIVE FORCE ⇒ measured in Volts • The “pressure” that provides the driving force for electricity to flow
  • 10. CURRENT: The flow of electrons in a circuit, measured in Amps or Amperes (similar to the flow of liquid in a fluid system)
  • 11. RESISTANCE: • The opposition to current flow, measured in Ohms • As current is resisted, heat is generated • Similar to a valve in a piping system
  • 12. POWER ! • Rate at which work is done, or energy is expended • Measured in watts or kilowatts • Like a car engine ⇒ more cylinders means more POWER
  • 13. OHM’S LAW VOLTAGE (E) = CURRENT (I) x RESISTANCE (R)
  • 14. INSULATOR: • Material that has a high resistance to current flow • The jacket around a wire or cable is an insulator-called insulation • Similar to the walls of a pipe, it keeps the fluid in
  • 15. CONDUCTOR : • Material that has a very low resistance to current flow • W itself is a conductor ire • Similar to the inner wall of a pipe, it allows fluid to flow • Most metals are good conductors
  • 16. CAPACITOR: • Device that stores a charge • W retain its potential ill (charge) even after the supply is removed • Similar to a storage tank in a system
  • 17. INDUCTOR: • Coil of wire wound to create a magnetic field • Used in motors, transformers and magnets • Similar to a radiator - coil of pipe used to radiate/transfer heat
  • 18. Effects of Various Levels of Current on the Body Current Value Effects on Body 1 – 10 mA Sensation of shock; Possibly painful 10 – 100 mA Painful shock; severe muscle contraction; breathing difficulties 100 – 200 mA Ventricular fibrillation; resulting in death if not immediately treated >200 mA Severe burns and muscular contraction