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Over 400 deaths occur annually from electric shock

Half of all deaths occur with low voltage outlets

On the job site, one death per day and 10-15 arc flashes

Amperes: measure of the rate of flow of electricity in a conductor

Volts: measure of electrical pressureWatts: measure of the amount of

energy or work that can be doneOhms: measure of electrical

resistance to flow

Page 4: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

Thus, the following relationship exists.

Work = Pressure x Flow

Watts = Volts x Amperes

Page 5: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

Ohm = RVolts = EAmps = IOhm’s Law: E = IR

I=E/R R=E/I

QuickTime™ and a decompressor

are needed to see this picture.

*Image from : http://home.neo.rr.com/mrwithdcc/Ohms.html

Page 6: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

This formula is commonly referred to as the West Virginia Formula

W=VA

When we know any two variables of the formula, we can calculate the other.

Page 7: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

Watts = Volts x Amps

Volts = Watts / Amps

Amps = Watts / Volts

Page 8: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

If we have a 100 watt lamp plugged into a 120 volt receptacle, we can determine the rate of flow or the

amperes for that circuit.

Amps = 100 Watts / 120 Volts

100 / 120 =.833 Amps

Page 9: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

If a water heater operates at 20 amps on a 240 volt circuit, what is the wattage of the appliance?

Watts = 240 Volts x 20 Amps

4800 Watts =240V x 20A

Watts=4800

Page 10: Over 400 deaths occur annually from electric shock Half of all deaths occur with low voltage outlets On the job site, one death per day and 10-15

If an electric motor operates at 2880 watts and 12 amps, what would be the voltage requirement for

that motor?

Volts = 2880 Watts / 12 Amps

2880 / 12 = 240 Volts

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