The document discusses the basics of electricity including definitions of ampere, volt, ohm, conductor, insulator, and dielectric. It then covers the harmful effects electricity can have on the human body, including burns, shocks, and internal injuries. Different types of burns are examined such as entrance and exit wounds, arc burns, and thermal contact burns. Electrical safety practices are also mentioned such as grounding and safety equipment.

1. Elec
P. C. Mishra,Ex. Er. Electrical

2. WELCOME
We are discussing and presenting :-
 BASICS
 EFFECTS ON HUMAN BODY
BURNS
SHOCK
ECG
EEG
ECT
ELETRCUTION
 ELECTRICAL SAFETY
SAFE PRACTICES
GROUNDING
SAFETY EQUIP
A VIDEO PRESENTATION
YOUR RESPONSE IN CASE OF ELECT. ACCIDENT

3. BASICS;
HUMAN BODY FOR ELECTRICITY
AMPERE
FERNCH- Mr. A. M. AMPERE
VOLT
ITALIAN- Mr. A. VOLTA
OHM
GERMAN- Mr. G .S. OHM
CONDUCTOR
INSULATOR

4. BASICS
DIEELECTRIC
NON AVAIBILITY OF MOBILE ELECTRONS FOR ELECT. CONDUCTION
DIEELECTRIC STRENGTH
POT. GRAD. REQ. TO CAUSE BREAK DOWN INSULATION. DRY AIR-3 KV/mm
FLASH OVER
DISCHARGE WHICH TAKES OVER THE SURFACE OF AN INSULATOR INCASE OF BREAKDOWN. IT IS LUMINIOUS
ELECT. ARC
HIGHLY LUMINIOUS INTENSELY HOT SELF SUSTAINING ELECT. DISCHARGE BETWEEN TWO ELECTRODES USUALLY
STARTS WHEN ELECTRODES CARRYING AN ELECT. CURRENT ARE DRAWN APART.

5. Electrical Arc Arc Flash
Electrical Discharge Through Dielectric

6. Electrical Flash Over

7. Note The Line is LIVE 11 KV
Watch the Daring Man !! What is going to happen?

8. Just after few seconds later of previous snap
Bang !!! A Flash Over

9. Failure of Dielectric strength of Air.

10. STEP POTENTIAL
P.d. Across one step of human being i.e aprox. 0.8 meter on the ground
TOUCH POTENTIAL
P.d across touch point of object and ground.

11. EARTHING
Earth is largest conductor which has a constant potential in spite of losing or gaining any charge
Covers the problem relating to conduction of electricity as a low impedance return path of the fault current

13. Earth wires all along the electrical wiring in the home

14. Harmful Effect of Electricity on Human Body
1.BURN
2. SHOCK
SC- dead cells is being shed and replaced continiously

15. BURN EVALUATION BURN DEGREE & % SURFACE AREA Effected.

16. First degree- like

22. Entrance Wound: High resistance of skin transforms
electrical energy into heat, which produces burns
around the entrance point (dark spot in center of
wound). This man was lucky, the current narrowly
missed his spinal cord.
Exit Wound: Current flows through the body from
the entrance point, until finally exiting where the
body is closest to the ground. This foot suffered
massive internal injuries, which weren't readily
visible, and had to be amputated a few days later.

23. Arc or Flash Burns
This man was near a power box
when an electrical explosion
occurred. Though he did not touch
the box, electricity arced through
the air and entered his body. The
current was drawn to his armpits
because perspiration is very
conductive
Thermal Contact Burns
Current exited this man at his
knees, catching his clothing
on fire and burning his upper
leg.

24. Internal Injuries
This worker was shocked by a tool he
was holding. The entrance wound and
thermal burns from the overheated
tool are apparent
Same hand a few days later, when
massive subcutaneous tissue damage
had caused severe swelling (swelling
usually peaks 24-72 hours after electrical
shock). To relieve pressure which would
have damaged nerves and blood vessels,
the skin on the arm was cut open

25. This worker fell and grabbed a powerline
to catch himself. The resulting electric
shock mummified his first two fingers,
which had to be removed. The acute
angle of the wrist was caused by burning
of the tendons, which contracted,
drawing the hand with them.