DC theory level 1 second edition lesson 4 conductor resistance and wattage loss

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

if a 250 foot number 12 copper conductor has a resistance of 0.397 ohms how much is the resistance of the same conductor at 800 ft

1.27 ohms 0.397/250 = x/800 multiply both sides by 800 to get X by itself

what is the resistance of a 600-foot number 12 aluminum conductor? The resistance of the conductor is 3.18 ohms / 1000 feet

1.91 ohms 3.18/1000 = x/600 multiply both sides by 600 to get X by itself

each kilowatt hour equals?

1000 watt hours

calculate the resistance of a piece of aluminum wire with a diameter of 100 mils and a length of 2 miles at 68 degrees Fahrenheit. be sure to First convert Mills to see Mills and use K value for the aluminum the reference

18.69 ohms 17.7 × 10,560/10,000

you wish to use number 18 tungsten wire at 20 degrees C to make a 10 Ohm resistor. What length of wire will be required for this job. be sure to use K value in the reference

479.29 L= R × K / A 10×1,620 /33.8

find the cross-sectional area of a conductor in millimeters squared when the diameter of the conductor is 25 mm.pi must be calculated as 3.14159

490 .8734375 a=( d/2)^2×3.14159 =(25/2)^2×3.14159

what is the formula to find the cross-sectional area of a cable in square inches

A=(d/2)^2×3.14

and the United States conductors are sized according to the ? standard or by the actual number of circular mil for the wire

American wire gauge

what is the formula to find the line loss

Pixar.... oh shit my bad P=I^2×R

the cross-sectional area of a American conductor is expressed in units called

circular mils

electrical energy usage is measured and volt amps

false

the unit of measurement used by electric companies to determine a monthly electric bill is the?

kilowatt hour

explain how to calculate the approximate cross-sectional area of a conductor in circular mils

measure the diameter of the conductor in inches. Multiply the result by 1,000 then Square it

what is the approximate gauge of wire that has a diameter of about 100 Mills

number 10 AWG

what is the formula for calculating the resistance of wire

r = k×l /a R is resistance in ohms K is the constant based on the material L is the length A is the area in circular mils

different wattage ratings are achieve for lamps with the same voltage rating by changing the value of the?

resistance

specific resistance is also called? And is abbreviated with the capital letter K or the Greek letter p

resistivity

the resistance of a specified length of wire of a certain type is directly proportional to its? and inversely proportional to its cross-sectional area

specific resistance

why will a lamp with a 100 ohm filament burn brighter than a lamp with a 300 ohm filament

there's less resistance in the 100 on filament. Therefore more current will flow causing more Heating and incandescent action

The Unwanted heat generated by an incandescent lamp is considered a power loss

true

the higher the resistance the lower the rated wattage of a lamp

true

the measurement kilowatt-hour expresses how much energy is used over a. Of time

true

lamps have both a? Rating and a? Rating

voltage / power

which of the following is not a characteristic that determines the resistance of a conductor

voltage rating of the conductor


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