There are several ways to connect circuits. What are the characteristics of I, u and R in series and parallel circuits? It is helpful for the responder to give an accurate answer

There are several ways to connect circuits. What are the characteristics of I, u and R in series and parallel circuits? It is helpful for the responder to give an accurate answer

The most basic connection of circuits is series connection and parallel connection. In series connection, the current flowing through is equal, while in parallel connection, the voltage at both ends is equal

Solving the physical electrical formula of grade two in junior high school (standard definition series circuit and parallel circuit)

Current definition formula I = q / T Ohm's law I = u / R series circuit I = I1 = I2 parallel circuit I = I1 + I2 voltage series circuit u = U1 + U2 parallel circuit u = U1 = U2 resistance series connection r total = R1 + R2 parallel connection r total = r1r2 / (R1 + R2) I = u / r u = IR r r = u / I P = w / T P = UI P = u ^ / R P = I ^ R q = uitq = u ^ / RT q = I ^ R

Formula and explanation of series connection and parallel connection
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1． I=I1=I2=… =U = U1 + U2 + +UN (characteristics of voltage in series circuit: in series circuit, the total voltage is equal to the sum of voltage at both ends of each circuit) 3. I = I1 + I2 + +The characteristics of current in parallel circuit: the current on the main circuit is equal to each branch

X times 3 / 4 equals 50 minus X

(3/4)x=50-x
3x=200-4x
7x=200
x=200/7

The surface area of a cube is 24 square decimeters. Divide it into two identical cuboids. The surface area of each cuboid is______ Square decimeter

The area of a surface of a cube is: 24 △ 6 = 4 (square decimeter), so the surface area of each cuboid is: 24 △ 2 + 4 = 16 (square decimeter), so the answer is: 16

12 divided by () = 0.75 = 24 () = (): 4 = () percentage

12 divided by (16) = 0.75 = 18 of 24 = (3): 4 = (75%) percentage
If you understand and solve your problem,

How to express all even numbers in 100-1000 that can't be divided by any number 3, 5, 7 in mathematical expression? No computer program
Pro, it's even numbers. In even numbers of 100-1000, all even numbers that can't be divided by 3, 5 or 7, how can we express them with mathematical expressions? Instead of excluding some numbers, we need to write all the numbers that meet the conditions. Thank you very much
Simplify the problem (just do this for me): how many even numbers within 100-10000 can't be divided by any number in 3, 5, 7, 9, 11, 13? How to calculate? Is there a formula to follow?
One more: 10226

All even numbers in 100-1000 that can't be divided by any number of 3, 5 and 7 can't be expressed by mathematical expression, so it's OK to count them
ten thousand two hundred and twenty-six

29.30.31.32.33.34.35.36.37 fill in the box, so that the three numbers of each horizontal, vertical and oblique line add up to 99?

362934
313335
323730

Predigested fraction a ^ 2-9 / A ^ 2 + 6A + 9 + A-3 / A + 3-a-a ^ 2 / A ^ 2 + 2a-3

(a²-9)/(a²+6a+9)+(a-3)/(a+3)-(a-a²)/(a²+2a-3)=(a+3)(a-3)/(a+3)²+(a-3)/(a+3)-a(1-a)/(a-1)(a+3)=(a-3)/(a+3)+(a-3)/(a+3)+a(a-1)/(a-1)(a+3)=2(a-3)/(a+3)+a/(a+3)=(2a-6+a)/(a+3)=(3a...

Fill the nine numbers - 4, - 3, - 2, - 1,0,1,2,3,4 into the nine palace grid, and the sum of the three numbers in each row, column and diagonal is required to be 0

1,2,-3-4,0,43,-2,-1