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As shown in the figure, the constant power supply voltage is 3V, the resistance R1 = 10 Ω, R2 = 30 Ω, when the switch is off, the ratio of A1 and A2 of the ammeter is; when the switch is closed, the ratio of A1 and A2 of the ammeter is Well, the first line is the power supply, the right between the first line and the second line is A1, the second line is R1 and A2, and the third line is R2 and s switches
When the switch is on the R1 branch, 1) s is off, the current expression is I = u △ R2 = 3 △ 6 = 0.5A 2)
The range of the power X of y = 3
The range of one part of X is all real numbers where x is not zero, so the range is a positive number which is not equal to 1
Unit: Unit / gram
gram per unit
gram/unit
Life is so beautiful
I was born in a happy family, with the love from my parents and the preference from my grandparents. In the past, I always thought that the nagging of my family was a meaningless battle of words, which was very boring. I became big and had my own ideas
Gree air conditioner, how many watts is one?
There is a specific name plate on the air conditioner
5A + 2B = 25, 3A + 4B = 15
5a+2b=25,（1）
3a+4b=15 （2）
2 * (1) - (2): 7a = 35
a=5
If we take a = 5 into (1), we get: 25 + 2B = 25
b=0
So the solution of the equations is: a = 5
b=0
The problem of electric power
What is the actual power of "6V, 3W" L1 and "6V, 1W" L2 connected in series with 8V power supply?
R total = R1 + R2 = 6 * 6 / 3 + 6 * 6 / 1 = 48 Ω
I＝8\48=1\6A
P1=I^2*R1=1\3w
The height of a lamp from the ground is h, and the height of a person is L. the person walks at a constant speed V, as shown in the figure. (1) try to prove that the shadow on the top of the person's head moves at a constant speed. (2) find out the change rate of the length of the shadow with time
(12 points) (1) when t = 0, the person is at o right below the street lamp. At t, the person goes to S. according to the meaning of the question: OS = ν t ① The intersection point m between the crossing lamp P and the line on the top of the human head and the ground is the position of the shadow on the top of the human head at the time T. as shown in the figure, OM is the distance from the shadow on the top of the human head to point O. the geometric relationship is: H
Junior high school physics. Solution. International system of units, the unit of speed is______ The symbol is_____ The common unit is_____ The symbol is_____ .
m/s,v,m/s km/h,v
In the experiment of simple harmonic vibration, the obstinacy coefficients of two springs are different. Can the periodic formula of vibration system be derived to seek the help of God
F = k1x-k2x = (k1-k2) x, which can be derived
Thank you!
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