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Electrical Safety
Electrical Fundamentals
Electrical Saftey
Danger Tag
Eye Protection
Operating Welder
Unapproved Sign
E LE CT RICAL
SAF E T Y
ELECTRICITY
• Energy in the form
of released or
moving electrons
• All atoms have
electrons - some
release easier than
oth...
VOLTAGE
• Potential that exists as
the result of a
substance’s ability to
release electrons
• an ELECTROMOTIVE
FORCE ⇒ mea...
CURRENT:
The flow of electrons in a circuit, measured in
Amps or Amperes
(similar to the flow of liquid in a fluid system)
RESISTANCE:
• The opposition to
current flow,
measured in Ohms
• As current is
resisted, heat is
generated
• Similar to a ...
POWER !
• Rate at which work is
done, or energy is
expended
• Measured in watts or
kilowatts
• Like a car engine ⇒
more cy...
OHM’S LAW
VOLTAGE (E) = CURRENT (I) x RESISTANCE (R)
INSULATOR:
• Material that has a
high resistance to
current flow
• The jacket around a
wire or cable is an
insulator-calle...
CONDUCTOR
:
• Material that has a very low
resistance to current flow
• W itself is a conductor
ire
• Similar to the inner...
CAPACITOR:
•

Device that stores a charge

•

W retain its potential
ill
(charge) even after the
supply is removed

•

Sim...
INDUCTOR:
• Coil of wire wound
to create a
magnetic field
• Used in motors,
transformers and
magnets
• Similar to a radiat...
Effects of Various Levels of
Current on the Body
Current Value

Effects on Body

1 – 10 mA

Sensation of shock;
Possibly p...
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Electrical safety

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Transcript of "Electrical safety"

  1. 1. Electrical Safety
  2. 2. Electrical Fundamentals Electrical Saftey
  3. 3. Danger Tag
  4. 4. Eye Protection
  5. 5. Operating Welder
  6. 6. Unapproved Sign
  7. 7. E LE CT RICAL SAF E T Y
  8. 8. ELECTRICITY • Energy in the form of released or moving electrons • All atoms have electrons - some release easier than others
  9. 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. 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. 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. 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. 13. OHM’S LAW VOLTAGE (E) = CURRENT (I) x RESISTANCE (R)
  14. 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. 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. 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. 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. 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
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