The meter measured the power of the microwave oven at home. He observed that the meter was marked with

The meter measured the power of the microwave oven at home. He observed that the meter was marked with

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Xiao Ming wants to use the electric energy meter to measure the electric power of the microwave oven at home. He observes that the electric energy meter is marked with 1600imp / kW · H (IMP means the number of flashes). When only the microwave oven is working in the circuit, the indicator light flashes 32 times in 1min, the microwave oven consumes kW · h in 1min, and its power rate is w

I want to ask: how to calculate the current in the electric control box? For example, the electric power of this equipment is 4kw, which is a three-phase current. How to calculate the current
I don't think others calculate the power divided by the current directly. Is it multiplied by what coefficient?

Given the capacity of three-phase motor, find the formula of rated current: capacity divided by kilovolts, quotient coefficient 0.76. Note: (1) the formula is applicable to any voltage level of three-phase motor rated current calculation

Three phase power calculation method?

Calculation of active power: P = uaiacos φ a + ubibcos φ B + uciccos φ C. where UA, Ub and UC are the phase voltage of three-phase load, IA, IB and IC are the phase current of three-phase load, cos φ a, cos φ B and cos φ C are the power factor of each phase of three-phase load
If the power supply is three-phase symmetrical power supply, that is, UA = UB = UC = u φ, and the three-phase load is symmetrical load, that is, IA = IB = ic = I φ, cos φ a = cos φ B = cos φ C = cos φ, then p = 3U φ I φ cos φ
When the load is Y-type connection, the line voltage Ue = √ 3 phase voltage U φ, line current ie = phase current I φ, so p = 3U φ I φ cos φ = 3 × (UE / √ 3) × ie × cos φ = √ 3ueiecos φ
When the load is delta connected, line voltage Ue = phase voltage U φ, line current ie = √ 3 phase current I φ, so p = 3U φ I φ cos φ = 3 × UE × (ie / √ 3) × cos φ = √ 3ueiecos φ
Therefore, no matter what connection method of load, active power P = √ 3 × line voltage × line current × power factor
Calculation of reactive power Q: active power and reactive power are related, that is, there is a formula: q = ptan φ, where φ is the power factor angle
Calculate the apparent power s: according to the power triangle, S & # 178; = P & # 178; + Q & # 178

Let a be a square matrix of order 4, R (a) = 3, and a * be the adjoint matrix of a, then R (a *)=

R(A*)=1
Because R (a) = 3, a * is not a 0 matrix, so r (a *) > = 1
AA*=|A|E=0
So r (a) + R (a *)

When a number is increased by 30%, it is equal to 52. How much is the number? (calculated by equation)

Let this number be X
x+30%x=52
1.3x=52
x=40
A: the number is 40

How many centimeters is an inch?

1 inch = 2.5399918 cm

Xiao Hua read a book. On the first day, he read 18 pages more than 21, and on the second day, he read 16 pages less than 6, with 172 pages left. How many pages are there in this story book?

Suppose there are x pages in this story book, the number of pages read on the first day: 18x + 21, the number of pages read on the second day: 16x-6, X - (18x + 21) - (16x-6) = 172, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X -- 18x-21-16x + 6 = 172, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

3a to the third power B minus 12ab to the third power

3a³b－12ab³
＝3ab(a²－4b²)
＝3ab(a＋2b)(a－2b)

A car and a big truck start from the same place of a and B respectively, and travel in opposite directions. The car travels 85 kilometers per hour, and the big truck travels 85 kilometers per hour
A small car and a large truck start from the same place of a and B respectively, and go in opposite directions
(1) how many kilometers is the distance between a and B? (2) how many kilometers does the car travel more than the truck from the start to the meeting?

① Distance between a and B = 85km / hx5h + 80km / hx5h
=825km
② Small cars travel more than big trucks = 85km / h * 5-80km / h * 5
=25km

The two adjacent sides of an isosceles triangle are 8cm and 17cm. What's the circumference of this triangle

The perimeter of this triangle is: 8 + 17 + 17 = 42 cm