1) 2) what is the function of resistance?

Capacitance: as the name suggests, it is used to load electricity. Just like the bucket is used to load water, it is a truth. Functions: 1. Prevent the direct current from passing, let the alternating current pass smoothly. Basically, it completely blocks the direct current from passing. 2. It can make the high-frequency current pass smoothly, and make the low-frequency current difficult to pass. That is to filter out the low-frequency current (wave)

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1. In parallel circuit, if one resistance decreases, what is the current shared by this resistance and what is the voltage, resistance and power of the other resistance in parallel In a series circuit, if one resistance decreases, what is the current shared by this resistance, and what is the voltage, resistance and power of the other resistance in series
2. In the series circuit of constant value resistor, sliding rheostat and ammeter, the voltmeter is connected in parallel at both ends of the resistor. If the voltage expression is 0 during the experiment, If the current indicator is 0 and the voltage indicator increases suddenly, what fault will happen?
3. Suppose that two resistors with resistance values of 1 ohm and 10 ohm are connected in parallel, and their equivalent resistance is R1. Three resistors with resistance values of 1 ohm, 10 ohm and 100 ohm are connected in parallel After (connecting), the equivalent is set to R2 A. R1 ＞ R2 B. R1 ＜ R2 C. R1 = R2 D. cannot be determined
4. How to calculate the electricity consumption of refrigerator in an hour What is the formula?
5. As shown in the figure, take a point E on the diagonal BD of square ABCD, make be = BC, make ef vertical BD, intersect CD with F. the line segment De is equal to EF and FC? Why?
6. As shown in the figure, in square ABCD, e is a point on the edge of BD, and be = BC, EF is perpendicular to BD, intersecting CD with F
7. As shown in the figure, the point E is on the diagonal BD of the square ABCD, and be = AB, EF ⊥ BD, EF and CD intersect at the point F to prove de = EF = FC
8. As shown in the figure, in the square ABCD, f is a point on CD, AE ⊥ AF, point E is on the extension line of CB, EF intersects AB at point G, proving: de · FC = BG · EC
9. As shown in the figure, in square ABCD, e is a point on the edge of CD, f is a point on the extension line of BC, CE = CF
10. As shown in the figure, in square ABCD, e is a point on CD, f is a point on BC extension line, CE = cf. (1) prove: △ BCE ≌ △ DCF; (2) if ∠ BEC = 60 °, calculate the degree of ∠ EFD
11. What is the maximum allowable voltage and current of a 2000 ohm resistor with a rated power of quarter watt?
12. A control circuit of hair dryer is designed. The sine input voltage of hair dryer is 50 Hz and 220 v. two resistors and position switches are required in the control circuit to realize three positions of 250 W, 500 W and 1000 W respectively. The equivalent circuit of switch in three positions of high, medium and low is drawn, and the component parameters are given
13. The resistance of an electric furnace is 48.4 Ω. How much work does the current do when it is connected to a 220 V circuit and energized for 5 minutes?
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16. It is known that: as shown in the figure, in RT △ ABC, ∠ C = 90 °, BC = 4, AC = 8, the point D is on the hypotenuse AB, make de ⊥ AC, DF ⊥ BC respectively, the perpendicular feet are e, f respectively, and get the quadrilateral decf, let de = x, DF = y. (1) use the algebraic formula containing y to express AE, and get AE=______ (2) find out the function relation between Y and X, and find out the value range of X; (3) let the area of quadrilateral decf be s, find out the maximum value of S
17. Does the angle between X, y, z axes in the coordinate system established by space vector have to be 90 degrees
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19. If the sequence {CN} = {an} * {BN}, {an} is the arithmetic sequence and {BN} is the proportional sequence Find the sum SN of {CN}
20. On the oscillation discontinuity of Higher Mathematics f（x）=sin（1/x）+1,x>0, sin（1/x）-1,x