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56 Cards in this Set
- Front
- Back
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Measurement of Electrical Pressure? |
Voltage |
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Measurement of flow of electrical current? |
Amp |
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All conductors have some resistance to the flow of electrons this resistance is measured in _____ |
Ohms - opposition to electrical current |
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It is a measurement of power. voltage by itself cannot perform any work and amps cannot flow without voltage. when a number of amps flow at a given voltage the result is ______ |
Watt |
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_____ is a mathematical equation that describes the relationship equation that describes the relationship between voltage amperage and resistance if any one of the three is changed, it affects the others. |
Ohm's Law |
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What is resistance? |
opposition to electrical current |
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What formula would you use to find voltage if power and resistance are known? |
square root of p times r |
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What formula would you use to find resistance if voltage and power are known? |
e squared divided by p |
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What formula would you use to find current, if power and resistance are known? |
Square root of p divided by r |
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What formula would you use to find power if voltage and current are known? |
EI |
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how many watts of power are being used in a circuit that has a resistance of 10 Ohms, and is drawing 4 amps of current? What is the voltage of the above circuit? |
P= ? R=10 I=4 4 squared X 10 = 160 P=160 E=40 |
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What is the current flow of a 480-volt circuit that is delivering 9600 watts of power? |
E=480 P=9600 9600 divided by 480 I = 20 |
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What is the voltage of a circuit delivering 10,000 watts of power with a current flow of 3 amps |
P=10000 I=3 10000 divided by 3 3333.33 = E |
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The rate of doing work equivalent to the amount of energy consumed per unit of time |
power |
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Is the rate at which electrical energy is transferred by an electric circuit |
Electric Power |
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Best Conductor |
Copper has one negatively charged electron on the outside ring |
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ACSR |
Aluminum Conductor Steal Reinforced |
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1 Hp = __watts |
746 |
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R |
Ohms Resistance has the symbol also |
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E |
volts electrical pressure |
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I |
Amps Intensity |
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p |
Watts Power |
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A water pump is drawing 1492 watts of power. How many Hp is this pump producing |
P=1492 1492 divided by 746 = 2 Hp= 2 |
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A 480-volt pump has a current draw of 6 amps. how many Hp is this pump producing? |
E=480 I=6 P=2880 2880 divided by 746 = 3.8 HP=3.8 |
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What is the voltage of a circuit that is providing 1250 watts of power through a resistance of 2 ohms? |
P=1250 R=2 Square root of 1250 X 2 E= 50 |
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What is the resistance of a 7200 volts circuit that has a current flow of 36 amps?how much power is produced? |
E=7200 I=36 R=200 P=259200 |
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What is the voltage of a circuit that has a current flow of 2 amps through 60 ohms of resistance? |
I=2 R=60 2 x 60 E = 120 |
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At what voltage range is power generated? |
13.8 kv - 24 kv |
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At what voltage are transmission lines energized? |
765kv - 230 kv 765, 500, 345,230 |
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At what voltage are sub transmission lines energized? |
138kv - 44 kv 44, 69,115, 138 |
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at what voltages are distribution lines energized? |
34.5 kv - 2.4 kv 7200/12470 , 7620/13200, 12000/20800, 14400/24940, 19900/34500 |
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Where in the electrical system is voltage stepped up? |
generation sub station |
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When would DC transmission be used? |
to prevent line loss, to get power over long distances. |
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Substations have 3 primary functions |
1.change the voltage of circuits from one level to another 2.connect of disconnect lines or equipment from each other 3.control the flow of power by adjusting the voltage and current |
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What is small-scale generation or dispersed micro generation? |
large companies purchase these systems to offset the high cost of power during peak load. |
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where is the last voltage step down? |
distribution |
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1Hp = __ watts |
746 |
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what is the maximum allowable distance an employee can free fall utilizing a fall arrest system? |
6 ft |
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what is the maximum allowable distance an employee can free fall utilizing a positioning device system? |
2 ft |
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at what height above ground does OSHA rule 1910.269 require the use of fall protection equipment |
4 ft |
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what are the strength requirements fo achorages used with fall arresst systems? |
5000 |
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what are the strength requirements for anchorages used with positioning device systems |
3000 |
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what type of fall protection system is required when working on a horizontal surface |
fall arrest system |
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what type of fall protection system is required when working on a vertical surface |
positioning device system |
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positioning device systems include _____ and ____ |
belts and positioning straps |
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Fall arrest systems include ____ ____ and _____ |
Harnesses, lanyards and achorages |
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suspension trauma is |
if an employee is suspended in a harness for too long of a time period |
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what is swing fall |
a situation in which the fall protection is anchored in a position that keeps the employee form falling to the ground but swings the employee into the part of the structure in which the lanyard or life line is attached |
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max weight of combined tool and body |
310 |
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maximum allowable distance fo deceleration device to expand |
3.5 |
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maximum arresting force on employee when using body harness |
1800 |
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maximum arresting force when using body belt |
900 |
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osha regulations regarding fall arrest and positioning device systems |
1910.269 1926.502 |
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Choosing and anchor |
1. strongest part of structure 2.reduce as much swing-fall as possible 3.keep it above your head if you can |
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Pole Hazards ___ ___ ___ |
verify the condition before you begin work verify the condition of adjacent pole be sensitive to your rigging techniques |
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another name for position device system |
work positioning equipment |
