2:1 / 4, 0.24:56, 0.2:1 / 5, 125:1 / 4

8,3/700,1,500

RELATED INFORMATIONS

1. In the experiment of measuring resistance by voltammetry, sliding rheostat has () A. Change the current in the circuit B. change the voltage at both ends of the measured resistance C. change the resistance value of the measured resistance D. protect the circuit
2. 3 / 8-5 / 6 =? It should not be divided into 9 / 24 to 20 / 24. If it is not enough, what should we do
3. Unit of measurement: how to convert kg to liter? When I compare AB glue, one unit is kg, one unit is liter, What is the conversion between kg and liter? Which unit should I use to convert AB glue?
4. If the lengths of the two sides of the triangle are 8 and 6 respectively, and the length of the third side is a real root of the quadratic equation x2-16x + 60 = 0, then the area of the triangle is () A. 24B. 24 or 85C. 48D. 85
5. Two bulbs marked with 220 V, 100 W and 220 V, 40 W are connected in series in a 220 V circuit. Why is 40 W better than 100 W
6. If we know that 3-2a of a + 2-4b + 5 of B = 0, then B of a =?
7. The resistance ratio of a and B is 4:5. If a and B are connected in parallel in a circuit, the total power consumed is 18W, then the electric power of a and B is respectively 18W____ W、_____
8. By solving the system of linear equations of two variables, A garment factory processes a batch of suits. It can cut 10 coats or 13 pairs of trousers every 15 meters. The existing material is 345 meters. In order to match the coats and trousers, how many meters of the material are allocated to the coats and trousers?
9. What are the physical quantities of electric power? What are their units? What are their letters?
10. A spring with stiffness coefficient K. cut it into two equal length segments, and then combine the two segments to form a new spring. What is the stiffness coefficient of the new spring
11. If the two fixed value resistors R1 and R2 are connected to the power supply in one way, the power consumed by R1 is 9 watts; if the two resistors are connected to the power supply in another way, the power consumed by R1 is 16 watts, and the current passing through R2 is 4a. What are the power supply voltage and the resistance values of R1 and R2
12. Simple operation 7 / 3 * 15 / 14 * 8 / 5
13. What is the current passing through the bulb marked with "220V 40W" in normal operation? What is the resistance in normal lighting
14. How to calculate the problem of 1002 & # 178; - 1002 * 4 + 4?
15. Power consumption on refrigerator: (kWh / 24h) 0.66 Is it 0.66 degree in one hour or 0.66 degree in 24 hours?
16. Solving the equation x & # 178; - X-1 = 2 / X & # 178; - x Such as the title
17. What's the meaning of "Oh, Miguel" in mathematical symbols
18. By using the collocation method, the quadratic equation of one variable X & # 178; - 4x-2 = 0 is transformed into the form of (a + b) &# 178;, then the root of the equation is
19. This is the complete title: During the movement of slide P of rheostat R0, the indication range of voltmeter is 0-4V, and the indication range of ammeter is 0.5-1A. Calculate the organization of resistor R, the maximum resistance of rheostat R0 and the power supply voltage U
20. First column, second column, third column, fourth column First line 1 2 9 10 second line 4 3 8 11 third line 5 6 7 12 fourth line 16 15 14 13