Transformer of 1. distribution electric power carries those who do not have work loss for nothing fast calculate
Transformer of distribution electric power, carry for nothing be worth without work loss:
Hold cost of voltaic bid one for nothing, by divide with the capacity with 100.
Sky of welder of alternating current of 2. single-phase 380V records loss fast calculate
Single-phase 308 electric machinery, more or less to carry loss to cover with tiles for nothing?
The capacity is multiplied directly 20, carry electricity for nothing 100 times.
3. does not have nameplate the capacity estimation of small-sized and single-phase transformer
Small-sized and single-phase transformer, nominal capacity volt-ampere is worth:
Sectional square counts core, multiply 8 by 8 except with 100.
Electromotor of 4. three-phase asynchronous, the estimation of synchronous rotate speed
Electromotor synchronism rotate speed, 3000 divide with extremely logarithm.
Electromotor of asynchronous of the small-sized rotor that wind a string starts 5. of resistor fast calculate
Circle line rotor electromotor, good computation of the resistor that start:
Rotor electric current divides voltage, quotient is multiplied 4 except with 7.
Press again extremely number comes section, half half another half.
6. crane deserves to use heavy electromotor rated power fast calculate
Have heavy electromotor power, minutely rice multiplies tonnage.
Its are accumulated by 2 except with 10, rely on grade kilowatt value nearly.
Electromotor of squirrel cage of 7. high pressure carries appropriate total pressure gently to start most high-power fast calculate
Electromotor of high-pressured squirrel cage, carry appropriate total pressure gently to start.
The greatest power that start is worth, match transfiguration quantity to multiply coefficient.
Start motor often, multiply 3 by 5 except with 100.
Start electric machinery not often, multiply 2 by 9 except with 100.
Electromotor of 8. three-phase asynchronous is homocentric type winding pitch fast calculate
Three-phase asynchronous electromotor, pitch of homocentric type winding:
Every extremely every photograph chamfer is numeric, by 2 accumulate number to be added again one.
9. rectangular generator is the smallest those who allow radius of bend fast calculate
Rectangular generatrix establishs smooth turn, radius of bend looks sectional.
Establish a turn with wide for the foundation, verdigris rolled steel multiplies multiple.
50 multiply 5 reach the following, steel half copper one aluminium times half.
50 by 6 reach above, steel one aluminium 2 copper times half.
Smooth turn with thick for fiducial, width 50 still be a bound.
Thick 5 the following all double, thick 6 above aluminium is added half.
Aluminum steel contortion 90 degrees, length is amounted to wide double half.
10. gas welding heats steel tube of cook over a slow fire heats of length fast calculate
Gas welding heats steel tube of cook over a slow fire, heat length needs estimation.
Angle of bend spends 90 degrees, decuple warm-up tubal way paragraph.
Of lifting capacity of safety of 11. steeliness pulley fast calculate
Steeliness pulley lifting capacity, pulley diameter millimeter is counted.
After the half another half, quotient square takes a number.
12. takes v/LIT all over the ground number of coil of electro-magnet combining form fast calculate
The platoon adds up to the electro-magnet of type, coil is v/LIT all over the ground several fast computation:
29 times voltage is worth, divide with core cut area.
Wiring of 13. indoor illume chooses lead cut area by voltage loss
Indoor illume is in charge of layout, insulation copper cash chooses sectional:
Beg rice of kilowatt of quadrature of carry on one's shoulder first, multiply next 5 except with 100.
Electric energy of 14. three-phase have rendered great service expresses the estimation that takes real load
Electric energy of three-phase have rendered great service is expressed, what bring bear kilowatt value:
Inside a minute dish revolution, except multiply with constant 60.
15. family expenses is single-phase electric energy list is the biggest allow what to take load fast calculate
Single-phase electric energy expresses family expenses, allow the biggest laden tile.
Power factor is equal to one, demarcate electric current multiplies coefficient.
Groovy ammeter 404, wide load is expressed 808.
16. chooses power of electric central heating fast calculate
Choose power of electric central heating, decuple area difference in temperature is accumulated.
17. shunt resistance is worth fast calculate
Shunt resistance is worth fast calculate, first multiple of appraise size block.
Next diploid Jiashangyi, purify large block gets small block.
The 7th quick consideration is fiducial several1. electric energy and heat energy are calculated fast conversion
Electric energy heat energy fast conversion, value of joule of made of baked clay second is equal.
Electric energy of 1000 made of baked clay hour, 3.6 million joule.
Electric energy heat energy fast conversion, every 4 made of baked clay seconds make an appointment with a calorie.
Two can the unit all is changed big, every spend 8639 calories.
The electrodynamic estimation between 2. parallel conductor
Carry stream between parallel conductor, attraction repulsion is fiducial several:
Electric current 10 thousand how to grow be apart from rice, 20 Newton are electrodynamic.
3. generatrix moves stable estimation
40 take 4 aluminous bus, use stable fiducial number:
300 millimeter alternate with is apart from, smooth put fulcrum to be apart from two meters.
Short-circuit current ten thousand and eight, if vertical stroke is put,take a place 3.
Fulcrum changes inverse ratio changes, span changes root to change.
The mark fiducial value of insulation resistance of winding of transformer of electric power of type of 4. oily dip fast calculate
Transformer winding is isolated from, insulation resistance watch detects.
60 degrees are fiducial calculate, class of 10 thousand bend over six.
Thirty thousand and five class 80 plan, 60 thousand bend over break up again time.
Every fall 10 degrees are multiplied times half, every rise 10 degrees times divide partly.
The capacity that 5. small-power electromotor receives capacitance of the job when moving to single-phase power source fast calculate
Three-phase electric machinery changes single-phase, need to receive capacitor capacity:
Astral form kilowatt is multiplied 60, horny form kilowatt is multiplied 100.
Capacity of the capacitor that start, astral form triangle is same.
Working capacitor capacity, multiply with 2.5 to 3.
Estimation of 6. voltage losing
Voltage loss is fiducial several, 2.5 aluminium 202.
Quadrature of carry on one's shoulder rice of 20 thousand tile, block sex load is nodded zero.
Quadrature of carry on one's shoulder is sectional into direct ratio, voltage is added fall square times.
Three-phase 4 lines are sixfold plan, copper cash is multiplied on 1.7.
Perceptual bear controls damage tall, 10 sectional impacts are little.
Power factor 0.8, 10 on in pairs is nodded 2 add.
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