Kirchhoff's law? 1. The sum of inflow electricity is equal to the sum of outflow electricity 2. What is the sum of electric power equal to the sum of voltage

The first law is called nodal equation: at any instant, the sum of current flowing to a node is equal to the sum of current flowing from the node (the node is the point where at least two lines intersect)
The second law is called loop equation: at any moment, when you walk around any loop in the circuit, the sum of the electromotive force in the loop is equal to the sum of the voltage drops on the resistors. For example, in the whole circuit, if the power supply has electromotive force and the voltage drops on the inner resistor and the outer circuit, the sum of the voltage drops is equal to the power supply electromotive force, It is also true when there are multiple power supplies in the circuit. If the power supply has a reverse direction, a positive direction is specified. Add the positive electromotive force of the power supply and subtract the negative electromotive force of the power supply, which is equal to the voltage drop in the circuit. If the current direction is opposite to the specified positive direction, the voltage of the resistance will be negative

How to calculate the theoretical value of the experimental current of Kirchhoff's law

Σ I = 0; Σ U1 of mesh 1 = 0; Σ U2 of mesh 2 = 0
Three current values can be obtained by solving three equations

There are 7 white balls and 24 yellow balls in the bag. How many white balls need to be added to make the number ratio of white balls and yellow balls in the bag 5:3?

How many square meters is 1 mu

1 ha = 10000 M2 = 100 mu = 15 mu, 1 mu = 100 m2, 1 m2 = 0.0015 mu, 1 mu = 666.67 M2---
The formula is "add half and move left three". 1 square meter = 0.0015 mu,

There are 156 students in the sixth grade of a primary school. 1 / 11 of the boys and 12 of the girls are selected. The number of the remaining boys is three times that of the girls. How many boys and girls are there in the sixth grade?
The remaining boys are twice as many as girls
I'm sorry. There's something wrong with the above

A: there are x boys and 156-x girls
X（1-1/11）=3*（156-X-12）
Can be: x = 43 / 33 * 144, not an integer, so the title is problematic
If 3 times is changed to 2 times, it can be obtained from the above method
X = 99, that is 99 boys and 156-99 girls = 57

If a = 5B = 8, the value of the above formula is

A / 4 + B / 6 = 8 / 4 + 8 / 5 / 6 = 2 + 4 / 15 = 2 and 4 / 15;
If you don't understand this question, you can ask,

What is the mass of sodium hydroxide and water required to prepare 500 ml of 10% sodium hydroxide solution (density 1.1 g / cm & # 179;)
To find the mass of sodium hydroxide and water, we need to use the formula to find the mass

Mass of sodium hydroxide solution = 1.1 × 500
=550 (g)
Mass of sodium hydroxide = 550 × 10%
=55 (g)
Mass of water = 550 - 55
=495 (g)
A: the mass of sodium hydroxide and water required is 55g and 495G respectively

Do I need the sixth grade math paper of PEP?

1、 Calculate (28 points) 1. Write the number directly. 4 points (approximate value sign is the estimation problem) 1322-199 = 1.87 + 5.3 = 2-2 △ 5 = (8 + 12) × 56 = 603 × 39 ≈ 4950 △ 51 ≈ 10 △ 10 × 10 = (): 6 = 5:3 2. Calculate the value of unknown number x (4 points) x-0.25 = 1.750.36 = x: 253

4 + 2,5 + 8,6 + 14,7 + 20,. So what's the 100th formula
Please explain the formula in detail

103+594

1. 2 / 9 by 1 / 6 plus 2 / 9 by 5 / 6
2. Seven eighths divided by five plus seven eighths multiplied by five

1、2/9 * 1/6 + 2/9 * 5/6
= 2/54 + 10/54
=12/54 = 2/9
2. 7 / 8 divided by 5 + 7 / 8 * 4 / 5
=7/8 * 1/5 + 7/8 * 4/5
=7/40 + 28/40
=35/40
=7/8
*It's a multiple sign

Kirchhoff's law? 1. The sum of inflow electricity is equal to the sum of outflow electricity 2. What is the sum of electric power equal to the sum of voltage