In the experiment of exploring the relationship between current, voltage and resistance, we should study the relationship between current, voltage and resistance

Control variable method

RELATED INFORMATIONS

1. The ammeter is equivalent to a resistance point in series with the meter head, and the voltmeter is equivalent to a resistance in parallel. What are the functions of the two resistors
2. What is the resistance symbol There is a frame in the middle. There is a horizontal line at the top and a horizontal line at the bottom, In the middle of a box, there is a horizontal line at the top of the left corner, and there is also a horizontal line at the bottom of the right corner. A diagonal line in the middle connects two horizontal lines. If you can explain it in detail, the more the better, there will be extra points
3. The price of type a refrigerator sold in shopping malls is 2190 yuan per unit, and the daily power consumption is 1 degree, while the price of type B energy-saving refrigerator is 10% higher than that of type a refrigerator, but the daily power consumption is 0.55 degree? (calculated according to the service life of 10 years, 365 days per year and 0.40 yuan per kilowatt hour)
4. A bulb is marked with pz220 100. In order to make the bulb work normally after being connected to the 330V circuit, what is the resistance in series or in parallel?
5. Two fixed value resistors R1 and R2 are connected in series to the power supply, and the total power is P1. They are connected in parallel to the original power supply, and the total power is P2. Assuming that the output voltage of the power supply does not change, then () A. P1 ＞ P2 B. P1 ＜ P2 C. P1 = P2 D. cannot be determined Is there an easier way to copy? Please don't wait online,
6. What is the voltage measured after the ammeter G is series connected with a resistor and refitted into a voltmeter? Is it the voltage of the optical ammeter g or the voltage of the ammeter with that resistor?
7. F. How to read MF, UF, NF, PF in Chinese? And their conversion?
8. One kW. H electric energy can supply the normal working time of the fluorescent lamp marked with 220 V and 40 W
9. Quadratic function f (x) = x & # 178; - x + A, if f (- M)
10. Let f (x) = x & # 178; - x + a (a > 0), if f (m)
11. Resistor R1 and R2 are connected in series in the circuit. If the voltages at both ends of R1 and R2 are U1 and U2 respectively, U1 is better than U2 = --
12. If the rated power of a bulb is 10W and the resistance is 10 Ω, the rated voltage of the bulb is______ In order to connect the lamp to a 12V power supply and make the lamp work normally, one needs to be connected in series______ Ohm resistance
13. Rated voltage: 220 V; rated power: 1200 W; frequency: 50 Hz; seek the voltage. Describe the possible reasons why the actual voltage is lower than 220 v. do not consider the influence of temperature on the resistance
14. In a series circuit, the higher the resistance, the higher the partial voltage and the higher the power The saying is: right, wrong
15. How to connect star delta step down starting control circuit of three phase asynchronous motor
16. 1. Any rational number has opposite numbers. 2. On the number axis, the numbers represented by the points on both sides of the origin are opposite to each other. 3. Which statement is true that positive numbers and negative numbers are reciprocal to each other
17. As shown in the figure, in the triangle ABC, ab = AC, angle BAC = 90 degrees, D is the midpoint of BC, De is perpendicular to DF, if be = 12, CF = 5, calculate EF
18. In the coordinate operation of space vector, what condition can satisfy the intersection of two vectors?
19. Let a be a third-order matrix, A1, A2, A3 are all three-dimensional vectors, satisfying that | A1, A2, A3 | is not equal to 0, Ask for a
20. In the two sequences {an} {BN}, an ＞ 0, BN ＞ 0, and an, BN ^ 2, an + 1 are equal difference sequences, and BN ^ 2, an + 1, BN + 1 ^ 2 are equal ratio sequences A1 = 1, B1 = root 2 find Sn = 1 / A1 + 1 / A2 +... + 1 / an