Experimental principle of side resistance of voltmeter and ammeter

Ohm's law r = u / I

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1. How do physical units EV and j convert? RT
2. What is 45 horsepower
3. How to calculate AC power I now have a voltage of 90a at 400 / 3 / 50. What is the power? This is AC, not DC How to calculate the single-phase 220 V?
4. ^What symbol does it stand for
5. Is the unit conversion between emergency currents a specific number or a scientific counting method
6. It is known that the image of y = f (x) is composed of two rays and a part of parabola in the figure below. The analytic expression of the function is obtained I didn't learn it well
7. (this is the article. Good points are added.) 1. What are the main features of the main part of the article? Can the order of several levels of this part be exchanged? What are the reasons? 2. What are the characteristics of the overall conception of the article? 3. Talk about the main function of the sentence at the end of the article 4. At present, China is strengthening the construction of new countryside, to gradually realize the urbanization of rural areas, so the author expresses his love for the rural areas in the south of the Yangtze River and the contradiction between strengthening the construction of new countryside? Please tell me your views and reasons
8. Given the arithmetic sequence [an], Sn = [(an + 1) / 2] ^ 2, find the general term formula of an N is subscript, the result of my own calculation is extremely troublesome.
9. Given two points a and B on the number axis, the distance between points a and B is 1, and the distance between point a and origin 0 is 3, then the number corresponding to point B is______ ．
10. The following sets are represented by the method of Property Description: (1) the set composed of even numbers; (2) the set composed of odd numbers; (3) A set of all natural numbers divided by 3 and 2; (4) A set of all trapezoidal bodies; (5) A set of rhombic collectives; (6) A set of squares Urgent, tomorrow
11. If R1 and R2 are connected in series to the same power supply, the power of R2 is P2. Then P1: P2 =?
12. 1. A "pz220-100" bulb, connected to a 200V circuit, the rated power of this bulb is______ W what is the actual power__________ W 2. An incandescent lamp is marked with the word "pz220-40". If the lamp is turned on for 4 hours every day, the power consumption will be 30 days per month____________ Kilowatt hour 3. 1 kwh of electricity can supply a 500W electric iron to work normally________ hour
13. In the space quadrilateral ABCD, e, F, G, h are the midpoint of AB, BC, CD, Da respectively. If AC ⊥ BD, efgh is what graph
14. In space quadrilateral ABCD, e, F, G and H are the midpoint of AB, BC, CD and Da respectively. If AC is perpendicular to BC, it is proved that efgh is a rectangle
15. A rectangle is divided into four different triangles, of which the area of the green triangle accounts for 15% of the rectangle, and the area of the yellow triangle is 21cm2 Area, main formula and method
16. Divide a rectangle with an area of 60 square centimeter into four different triangles. The area of the green triangle accounts for 15% of the area of the rectangle, the area of the yellow part is 28 square centimeter, and the area of the red part is 12 square centimeter. Calculate the area of the blue triangle
17. As shown in the figure, a rectangle is divided into four different triangles. The area of the green triangle accounts for 15% of the area of the rectangle. The area of the yellow triangle is 12 square meters more than that of the green triangle. How many square meters is the area of the green triangle?
18. As shown in the figure, there are two intersecting line segments Mn, EF in square ABCD, m, N, e, f on edge AB, CD, ad, BC respectively. Student a thinks: if Mn = EF, then Mn ⊥ EF; student B thinks: if Mn ⊥ EF, then Mn = ef. Do you think () A. Neither is right. B. both are right. C. only a is right. D. only B is right
19. As shown in the figure, there are two intersecting line segments Mn, EF in square ABCD, m, N, e, f on edge AB, CD, ad, BC respectively. Student a thinks: if Mn = EF, then Mn ⊥ EF; student B thinks: if Mn ⊥ EF, then Mn = ef. Do you think () A. Neither is right. B. both are right. C. only a is right. D. only B is right
20. Em, MF, Mn, NH and ng divide the rectangle ABCD into four equal parts, Where FG = BG + BC + CH = eh = de + Da + AF, Mn parallel AB, BC = 19, Mn = 7, find the length of ab The level is too low to pass pictures. Ad and BC are wide, DC and ab are long, e and H are on DC, F and G are on AB, m and N are in rectangular ABCD. Connect dehc, afgb, ad, CB, EM, MF, ng and HN D E H C M N A F G B