Second grade physics "Ohm's law" questions There are at least 10 choices, 10 blanks and 4 calculations

Second grade physics "Ohm's law" questions There are at least 10 choices, 10 blanks and 4 calculations

"Ohm's law" exercise 1. Fill in the blanks (3 points for each question, 30 points in total) 1. The current in the conductor is proportional to the voltage at both ends of this section of conductor and to the resistance of this section of conductor. This conclusion is called the law. 2. As shown in the right figure, the total resistance of the circuit is Ω. Given that the voltage at both ends of R1 is 4V, then the current passing through R2 is a, both ends of R2

Exercises of Ohm's law
1. Use Ohm's law formula to calculate the resistance value after series connection or parallel connection. Please calculate: what is the equivalent value of a resistor if two 10 ohm resistors are used in series? If they are in parallel connection, what is the equivalent value of a resistor?
2. There is a bulb connected to a 36V circuit, and the current passing through it is 0.6A. It is known that the bulb can pass at most 3a of current. Now it is found that there is a fault in the circuit, can we temporarily connect the bulb to a 220V circuit for emergency use? (assuming that the resistance of the filament remains unchanged, at least two methods are used to calculate and explain)
PS：

1) Series resistance addition, r = 10 × 2 = 20
Reciprocal sum of parallel resistance
1/R=1/R1+1/R2
R=5
2)
The bulb resistance is 36 / 0.6 = 60 ohm
Under the voltage of 220 V, the passing current is 220 / 60 > 3a
Because of the circuit fault, so consider the worst case short circuit, 220 V all on the bulb
So the light bulb will burn out and can't be used

As shown in the figure, △ ABC, BF ⊥ AC in F, CG ⊥ AB in G, D and E are the midpoint of BC and FG respectively

Connecting Gd, DF, ∵ BGC = < BFC = 90 °, both ∵ BGC and ∵ BFC are RT △, ∵ D is the midpoint of BC, ∵ GD and DF are the midlines on the hypotenuse of RT △ BGC and RT △ BFC respectively, ∵ GD = BC / 2, DF = BC / 2, (the midline on the hypotenuse of RT △ BGC is half of the hypotenuse), ∵ DG = DF, ∵ DGF is isosceles ∵ GF = EF, (it is known that

Standard pronunciation of English words in Grade 3-6 of primary school

Golden sun has a series of advantages
Happy back words, which contains 6 - 7 versions of the textbook, you can go to see

Grade 5 Volume 2 unit 2 composition picture composition 400 words
=-=Fuck, my sister took this ID and asked for the composition --

After the football match, the students of czechoman primary school came to the green
They are divided into "denoban" team and "golden" team. The players on both sides are full of fighting spirit
Only a few of them made their hats and schoolbags into the goal and opened up for the competition. The fierce competition that was about to start attracted many younger brothers and sisters, and even the adults who passed by stopped to sit on the stone bars to watch
At the end of the warm-up, under the referee's whistle, the two sides began to fight for football. You kick and I sweep, but the competition was fierce. Suddenly, the captain de nuoban came with an upside down golden hook, and the ball passed to the foot of the player aronax. The "de nuoban" team was about to shoot! At this time, the air seemed to condense, and everyone's eyes were wide open, breathing heavily, because, The result of the last few days may be decided by this shot! Aronax looked at the football, hesitated for a moment, and then the ball was quickly snatched from his feet by Bruno of golden team. However, konsai of denoban team swept the ball to his feet with "Lingbo micro step" under the competition of many feet, He didn't hesitate like Arronax. He spun the ball to the instep of his foot and kicked the golden goal like a tiger. At this time, the audience couldn't help shouting "Wow!". Looking at the other golden team, the goal keeper was calm and calm Burian. Burian watched the front with alert eyes and arched his back, He was wearing leather gloves, and he didn't care if his knee was broken. When he saw the football flying like a bomb, his eyes lit up, and he jumped up like a loose spring. Ignoring the danger, he changed his center of gravity, and fell heavily on the grass with the ball in his hand. "Great!" after Burley settled down, it was Dick, his brother with a big stomach, who caught the ball, As Hou Bu, he could not help cheering happily. Then, the audience burst into thunderous applause. At this time, just listen to the referee's whistle, time has come
Now, the scores of the two teams are still tied, and they have to wait for tomorrow's showdown. Although the "denoban" team didn't score, they are proud of konsei's agility and the good move! On the right side of a house, there is a space. It's a good place to play football. After school, the children go to that space to play football
The children used schoolbags as gateposts, and the game started. The players from both sides played hard and fiercely. The younger brother and younger sister attracted them, and even the passing uncle was also attracted by the game
The golden haired goalkeeper, wearing gloves, squatting, leaning forward slightly, his hands on his knees, and he didn't care if his knees were abraded. He was really like a real goalkeeper. He was absorbed in the front, as if both sides were going to score here. The substitute behind the goalkeeper stood there with a big stomach, thinking: let me play, let me show my skills
All of them held their breath and looked at the distance. It can be seen that the two sides were fighting fiercely. A host brought a beautiful dog to watch the fierce competition. He blocked the little boy with a hood behind him. The little boy just stood up and watched. A pair of brothers paid close attention to the changes on the court. The elder brother held his younger brother tightly. The little girl with a red hat was blocked by others, She leaned forward to watch the game. The little girl sitting next to her holding a doll was as numb as if the game had nothing to do with her. The lovely little white dog didn't like the game and fell asleep beside. The uncle seemed to remember the wonderful memories of playing football when he was a child, with a smile on his face
The wonderful game goes on

In acute triangle ABC, AB is greater than AC, CD and be are ab respectively
In the acute triangle ABC, AB is greater than AC, CD and be are the heights on the sides of AB and AC respectively. The vertical line passing D is BC, intersecting be at F, intersecting the extension line of Ca at P, intersecting e is BC, intersecting CD at g, intersecting the extension line of BA at Q. try to explain that BC, De, FG and PQ intersect at one point
(to

Hahaha, it's really cool to solve the problem
I did this:
First, let the perpendicular foot of DF vertical BC be m, and the perpendicular foot of EG vertical BC be n,
If the four lines BC, De, FG and PQ intersect at one point, because the triangles are similar, then FM / GN = DM / en = PM / QN. Therefore, just prove this,
Because PM is parallel to QN, triangular PMC is similar to triangular enc
Triangle DMC is similar to triangle GNC
Triangle QNB is similar to triangle DMB
Triangle ENB is similar to triangle FMB
So PM / en = DM / GN is DM * en = PM * GN
DM * en = QN * FM from QN / DM = en / FM
So QN * FM = PM * GN
So PM / QN = FM / GN
Then, because these four are vertical, the square of DM = BM * cm
Square of en = BN * cn
Square of DM / square of en = (BM * cm) / (BN * CN) = (FM / EN) * (DM / GN)
DM/EN=FM/GN
I'm done,
I'm so tired. It took me more than an hour

Mr Green and Mrs Green have a son . Johnson They
Mr Green and Mrs Green have a son . Johnson They love him very much .Johnson is 3 years old .he likes asking quastions.
one day Mr Green is sitting in a chair .he is reading a book and he has a banana in his hand .
He likes to have it. Johnson comes in he asks Mr Green.“Dad .what's that ?” Mr Green is isinterested in the book . he doesn't hear Johnson. Johnson shakes his father's leg and asks again . “what's that , tell me ”,“leg.” says .Mr Green .
Johnson gues out and says to Mrs Green .“Mum ,I want to have a leg ”
Can you translate for me?

Mr. and Mrs. Green have a son named Jason Johnson. They love him very much. Jason Johnson is three years old. He likes to ask questions. One day, Mr. Green was sitting in a chair reading a book with a banana in his hand. Mr. Green likes to eat bananas. Jason Johnson came in and asked Mr. green: Daddy, what's that? Green

Given that x minus y equals 2, Y-Z equals 2, x plus Z equals 14, find x ^ 2 minus Z ^ 2 (read the second power of x minus the second power of Z)

x-y=2,y-z=2 x+z=14
x-z=4 x^2-z^2=4×14=56

Know how to calculate the area of the hypotenuse of a right triangle

If it is an equilateral right triangle, then the area is unique, a 2 + B 2 = C 2, a = B, s = a * B / 2

In the simple present tense, how does the predicate verb change when the subject is the third person singular

To be is to become is.she It's a good girl. It's a good girl. It's a good girl. It's a good girl piano.she goes to school by bus.she wants to buy a car.she wears a hat today...