1. Basic Electricity

2. Term Comparison Pressure Flow Back Pressure Hydraulic PSI GPM
Resistance
Back Pressure
Hydraulic
PSI
GPM
Electrical
Volts
Amps
Ohms

3. Electrical pressure causes electric current to flow
Voltage (Pressure)
Electrical pressure causes electric current to flow

4. Ability of material to prevent electrons from flowing
Resistance (Ohms)
Ability of material to prevent electrons from flowing

5. Resistance Conductors - little resistance Metals Water
Insulators - high resistance
Rubber
Dry wood
Pottery
Glass
Porcelain

6. Human Resistance Body Area OHMS Dry Skin 600,000 Wet Skin 1,000
Internal Organs
Ear to Ear

7. Current Flow of electrons
Measured in amps or milliamps (1/1000 of amp)
Killing factor

8. Effects of Current 1 - 8 mA = Shock, not painful 8 - 15 mA = Pain
15-20 mA = Muscle contraction
mA = Severe pain & paralysis of breathing muscles
mA = Ventricular fibrillation
> 1,000 mA = Heart stops

9. 60 watt bulb uses 1/2 amp (500 mA) 5 times current needed to kill
1 Amp = 1,000 Milliamps
60 watt bulb uses 1/2 amp (500 mA)
AND
5 times current needed to kill

10. E I R Ohm’s Law E = Voltage (volts) I = Current (amperes)
R = Resistance (ohms)

11. Fatalities at 50 Volts 50 Volts 50 Volts 1000 Ohm = .05 amps (50 mA)

12. Body Resistance Dry skin Ear to ear Hand to foot Wet skin 110V
350K Ohm = 1 mA
Ear to ear
110V
100 Ohm = 1.1 A
Hand to foot
110V
500 Ohm = 220 mA
Wet skin
110V
1000 Ohm = 110 mA

13. 100 mA for 3 seconds equals 900mA for .03 seconds
Severity Of Shock
Amps
Path
Duration
100 mA for 3 seconds equals 900mA for .03 seconds

14. Hazards
Shock
Burns
Arcing