How to find 4 resistors?

Analysis: From the circuit diagram, it can be seen that 1. The 3 ohm resistance and the 6 ohm resistance are connected in parallel to obtain 2 ohms.

2. The 2 ohms obtained above are connected in series with the 5 ohm resistors in the figure to obtain 7 ohms.

3. The 7 ohms obtained in the previous step are connected in parallel with the 7 ohm resistance on the right side of the figure to obtain the ohms.

It can be seen that the total equivalent resistance values of the 4 resistors in the diagram are ohms.

Current i1 e r total 42 amps.

Current i3 e r right 42 7 6 amps.

Since the 3 ohm resistor is connected in parallel with the 6 ohm resistor, we get r 2 ohms, and this 2 ohm is connected in series with the lower left 5 ohms of r in the diagram, then the voltage at both ends of the "2 ohms" resistor is.

u [ e (r r lower left)] r [ 42 (2 5)] 2 12 volts.

So the current through the r6 ohm resistor in the diagram is.

i u r 12 6 2 amps.

It is visible that the current i2 i3 i 6 2 8 amps.

i.e. i1 12 A, i2 8 A, i3 6 A.

The resistance values of the equivalent resistors of the four resistors are:

Equivalent resistance = 3 ohms and 6 ohms in parallel and then in series with 5 ohms, and then in parallel with 7 ohms after series connection, the result is ohms.

i1=42 ohm=12a

i2=8ai3=6a

Formula for resistor calculation:

1) r = l s (where the resistivity of the resistor is determined by its own properties, l is the length of the resistor, and s is the cross-sectional area of the resistor).

2) Definition: r=u i

3) Total resistance in series circuit: r=r1+r2+r3+......Total resistance in a parallel circuit of rn(4): 1 R=1 R1+1 R2+......1 rn(5) find resistance by electrical power:

r=u²/p；r=p i Description: In physics, resistance indicates the magnitude of a conductor's resistance to an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current.

The resistance of different conductors is generally different, and resistance is a characteristic of the conductor itself.

Summary. Hello, glad to answer for you! I am Mr. Wu, an education expert, with a total of more than 1,000 1v1 people, and many years of experience in educational technology. Please be patient and answer for you soon, and the answer is being sorted out

Hello, glad to answer for you! I am Mr. Wu, an education expert, with a total of more than 1,000 people in 1v1, and I have many years of experience in educational technology. Please be patient and wait, I will answer for you very quickly, and the answer is being sorted out

Parallel: r total = (r1*r2*...)rn)/(r1+r2+..rn) series: r total r1 + r 2 + .rn

If my seepage is helpful to you, please give me a slow and like, thank you for the disturbance! Finally, I wish you a happy life

If you don't know the resistance values of R22 and R24, but you know that the voltage at the detection point is 333V, how can I find the two unknown resistance values?

Hello, because I know the voltage of the detection point, there is no total voltage, the voltage of R23 can be found, and the voltage of R24 can also be found, because the two resistors are connected in series, so the total resistance is equal to the sum of the two of them.

How to find R22 and R24.

We just need to solve it [than the heart] [than the heart].

If you give another thing a condition and replace R25 with 800K, then the voltage of the detection point is 324V, so how to find the base fibrillation R22 and the cover Fengchun R24 at this time

Hello, the same is still using the above relationship, the plant can change the corresponding tissue and voltage.

Hello, please take a look at the ** I sent you, this kind of question can use this formula to do [heart].

But the problem is that I don't know how much R5 is always with R6, and even if this formula is brought in, the equation can't be solved.

You know the formula for connecting two resistors in series.

According to the formula, the total resistance can be calculated.

，r33……The resistance in the circuit is filed, which is equivalent to the house number of the family in the pure leather community.

09 is a resistance value line pants ant. You can refer to the table below.

How to read the resistor color ring:

According to the number of color rings, it is generally divided into four color rings and five color rings. Each color wheel represents a different meaning, as shown in the image below.

Four-color ring reading method The first color circle: the first significant digit; Second color wheel: second significant number; The third color wheel:

Indicates magnification; The fourth color ring: Shiye Chun indicates error, that is, accuracy; Four-color ring example: First color wheel:

yellow, for 4; The second color wheel: purple, which represents 7; The first three color rings: red, representing the square of 10; The fourth color wheel:

brown, for 1%; So, the resistance of this resistor is 47 10 2 = 4700 = ohms, and the error is 1%. Five-color ring reading method The first color circle: the first significant digit; Second color wheel:

the second significant figure; 3rd color wheel: 3rd significant digit; The fourth color wheel: indicates magnification; Fifth color wheel:

Represents error, i.e., accuracy; Examples of five-color rings: the first color circle: yellow, which represents 4; Second color wheel:

purple, for 7; The third color wheel: black, for 0; The fourth color wheel: brown, representing 10; Fifth color wheel:

brown, for 1%; So, the resistance of this resistor is 470 10 = 4700 = ohms and the error is 1%. In reality, no one will memorize the value represented by the color ring, and now many color ring colors are not standard, which brings interference to identification. If you meet a person in real life who can read the resistance correctly without the help of any tools but only through the color ring, then call him the great god.

2. There is a digital silk screen on the surface of the reading method, as long as the meaning of the number is clear, the resistance value and accuracy can be determined. The accuracy of chip resistance resistance error is 1%, 2%, 5%, 10% accuracy, the most commonly used are 1% and 5%, 5% accuracy is represented by three digits, and 1% accuracy is represented by four digits. Here are some examples:

The silk screen on the surface of the resistor is 103: the first two digits 10 represent significant figures, and the third digit 3 represents the magnification, that is, 10 3, so the resistance value of the 103 resistor is 10 10 3 = 10000 = 10k, and the accuracy is 5%. The silk screen on the resistor surface is 1502:

The first three digits 150 represent significant figures, and the fourth digit 2 represents the magnification, that is, 10 2, so the resistance value of the 1502 resistor is 150 10 2 = 15000 = 15k, and the accuracy is 1%. There is also a case, that is, the case of silkscreen with r, which means that there is a resistance with a decimal number, and the position where r is located is the position of the decimal point. The silk screen on the surface of the resistor is R047:

The position of r represents the position of the decimal point, and r047 represents the resistance of ohms.

Formula: Brown, red, two orange are three, four yellow, five green, six are blue, seven purple, eight gray and nine white, black is zero number hidden, gold, five silver, ten tables error limb Zen.

The first three rings of the five-ring resistance are numbers, the fourth ring represents the number of times the resistance value, and the last ring is the error.

Color wheel sorting judgment.

Tip 1: Find the color wheel that marks the error first, so as to arrange the color wheel order. The most commonly used color to indicate resistance error is:

Gold, silver, brown, especially gold rings and silver rings, are generally rarely used as the first ring of the resistance color ring, so as long as there are gold rings and silver rings on the resistance, it can be basically determined that this is the last link of the color ring resistance.

Tip 2: In practice, you can judge the interval between the color rings: for example, for a resistor with five color rings, the interval between the fifth and fourth rings is wider than the interval between the first and second rings, so that the order of the color rings can be determined.

Because of the mega1 r=1 r1+1 r2

So 1 with coincidence r2 = 1 r-1 r1 = 1

r2=490 51 (k)