The relationship between current and voltage of a small bulb marked "6V & nbsp; 3W" is shown in the figure. If it is connected with a resistor with 8 Ω and connected in a circuit with 4V voltage, the power consumed by the whole circuit is () A. 2WB. 3.2WC. 3.6WD. 5W

The relationship between current and voltage of a small bulb marked "6V & nbsp; 3W" is shown in the figure. If it is connected with a resistor with 8 Ω and connected in a circuit with 4V voltage, the power consumed by the whole circuit is () A. 2WB. 3.2WC. 3.6WD. 5W

According to Ohm's law, the current passing through R is IR = URR = 4v8 Ω = 0.5A, and the current passing through bulb is IL = 0.4A

If the chord a B is a parabola y 2 = 8 x through Q (4,1), and Q is the midpoint of the chord, the equation of the straight line a B is obtained

Let a (x1, Y1), B (X2, Y2) then Y12 = 8x1y22 = 8x2 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; subtract the two formulas to get (Y1 + Y2) (y1-y2) = 8 (x1-x2), so 〈 Y1 − y2x1 − x2 = 8y1 + Y2, and & nbsp; & nbsp; Y1 + Y22 = 1 〉 KAB = 4 linear AB equation: Y-1 = 4

Why is the thinner the conductor, the greater the resistance?
Is it proportional?

Analogy water pipe
The finer the pipe, the more difficult it is for the water to pass through, and the thicker it is, the easier it is
The conductor is thin, the current is difficult to pass through, so the resistance is large
Analogy is often used in physics, and it is very effective
Hope to solve your problem

In order to complete the supply contract, a factory decided to produce 4000 parts within a certain number of days. Due to the technical transformation of the original equipment, the production efficiency was improved, and the production increased by 25% every day compared with the original plan. Therefore, the task can be completed 10 days in advance. How many parts are produced in the original plan?

Suppose that the original plan produces x parts per day. According to the meaning of the question, we get: 4000x − 4000 (1 + 25%) x = 10. The solution is: x = 80. After testing, x = 80 is the root of the original equation. Answer: the original plan produces 80 parts per day

If the ratio of the corresponding sides of two triangles is 1:3, what is the ratio of their areas

1:9
The area ratio is the side length square ratio

-(x-3) = 27, find the value of X

-(x-3)=27
x-3=-27
x=-27+3
x=-24

How much voltage or current of button battery is normal?

Rechargeable battery is 1.2V, ordinary is 1.5V. The current is 700, 800, 1600 Ma!

The publishing house is: Beijing Education Publishing House, Sanqin publishing house. I searched it, but I didn't find it
English is OK
The following three big characters are the new curriculum standard and letters, such as mathematics, and the following is a C
English is e, others I am not clear

The summer homework in different regions will be different. Even in the same city, the arrangement of summer homework in different districts and counties will also be different. Moreover, there are many different versions in different regions. How to answer this? It's estimated that no one can give a complete and accurate answer. I personally think it's hard for you to think about it for such a long time in summer vacation, You can turn to your classmates or teachers

The output power of the motor is ()
The correct answer should be: the square r of ui-i

The total power of electric appliance P = UI, this formula is applicable to any load. Resistance heating power P = I ^ 2 * r, Joule's law is applicable to any calculation of pure resistance heating power. If electric appliance has other energy conversion, it is necessary to calculate other energy. For example, the bulb not only generates heat, but also emits light; electrolytic cell also calculates chemistry

Simple calculation of 33 * 32 + 66 * 34

33*32+66*34
=33*32+33*68
=33(32+68)
=33*100
=3300