Can an alternating current circuit pass through and resistively shunt

Ohm's law applies not only to DC circuits but also to AC circuits, so both DC and AC circuits can be shunted by parallel resistors.

1. The shunt must have a purpose, 1. The main physical feature of the resistance is to transform the electric energy into thermal energy, which can also be said to be an energy-consuming element, and the current passes through it to generate thermal energy.

2. The resistors are connected in parallel in the circuit and play the role of shunt.

3. For the AC electrical circuit with pure resistance, it can be shunted through the parallel resistor.

4. For AC circuits containing capacitive inductance, because the resultant reactance Z of inductive reactance XL and resistance R, capacitive reactance XC and resistance R are all right-angle triangles, and Z is the hypotenuse. Therefore, it is generally not possible to directly shunt with resistors. z=r*sin is not a linear relationship.

5. For example, in order to expand the range, the AC ammeter uses a current transformer to detect the line current. Secondly, the scale of the current dial has also become uneven; Third, the structure of the head of the meter should also be greatly changed.

Yes. It's like diverting water through a pipe, regardless of whether it's cold or hot.

Yes, if you only look at the effective current, the alternating current can be treated in the same way as the direct current, and the reactance of the resistance can be regarded as zero.

OK; However, if the circuit still satisfies Ohm's law, the shunt circuit is required to have the same properties as the original circuit (i.e., resistive, capacitive, inductive or resistive inductive, resistant-capacitive, ---).

The shunt resistor can achieve the purpose of shunting.

1.The voltage at both ends of the voltage source is constant, the current source is constant, and the current in the resistor is only related to the voltage at both ends of the resistor (because the resistance is constant).

2.So ir=u r, i.e., divide the voltage of the voltage source by the resistance.

3.The current source is an interference condition here and can be disregarded. The current from the voltage source can be outgoing or inflowing, but it is not considered in this problem.

The 12V voltage source on the left is connected in series with a 2 ohm resistor and can be equivalent to a 6 amp current source connected in parallel with a 2 ohm resistor, and the current source current direction is vertically upward.

Next, on the left is a 3 amp current source in parallel with a 6 amp current source (9 amps combined), and a 2 ohm resistor in parallel with a 2 ohm resistor (1 ohm in total), which can be equivalent to.

9 amp current source in parallel with a 1 ohm resistor. In order to unify with the 4V voltage source on the right, continue to equivalentize a 9V voltage source (polarity: positive up and negative below) with a 1 ohm resistor in series.

At this point, the left side of the circuit becomes a 9V voltage source with a 1 ohm resistor in series, and the right side is the 4V voltage source in the original diagram, with a 9 ohm resistor in series (2 ohms and 7 ohms in series results in 9 ohms). Now continue to simplify, because the polarity of the voltage source at this time is reversed in series, so take the polarity of the power supply (9V) with a larger voltage as the reference polarity, the voltage of the equivalent voltage source is 5V (9V - 4V), and the remaining resistance is 10 ohms (1 ohm resistance in series 9 ohm resistance), and the current of each electrical appliance is A

Summary. The resistor divider principle is applicable to DC circuits, and under normal conditions it is only suitable for steady-state conditions, not for AC circuits. In AC circuits, the phase angle of the resistor divider and components such as capacitance and inductance will change, so more complex circuit analysis methods such as complex voltage method and phasor method need to be considered.

The resistor divider principle is applicable to DC circuits, and under normal conditions it is only suitable for steady-state operation and quiet conditions, not for AC circuits. In AC circuits, the phase angle of the resistor divider and the capacitor, inductor and other components will cause side or slag changes, so it is necessary to consider more complex circuit analysis methods such as complex voltage method, phasor method, etc.

I'm still a little confused, can you be more detailed?

The resistor divider principle applies to DC circuits, not AC circuits. This is because the impedance of the resistor in an AC circuit is frequency-dependent, and the voltage distribution is different from that of the DC case, which is actually composed of a resistor, an inductor, or a capacitor source-closed. As a result, it is not possible to accurately calculate the voltage distribution in an AC circuit using a simple resistor-divider formula.

For the voltage division problem in AC circuits, it is necessary to comprehensively consider the impedance and phase difference of components such as resistance, inductance, and capacitance. As a result, the resistor divider concept is usually only applicable to DC circuits.

The purpose of shunting can be achieved through the parallel connection of resistors, and the current section is in line with Ohm's law, if the resistance is larger, the current will be smaller, so it should not be significant.

The parallel circuit is a connection mode for circuits, lines or components to achieve the function of a certain design requirement, which is characterized by the connection of two components of the same or different classes, circuits, lines, etc., and the tail is also connected at the same time.

In parallel circuits, the formula for calculating the magnitude of the resistance is: 1 r=1 r1+1 r2+1 r3 (r1, r2, r3......).indicates the resistance of each branch);If there are only two resistors in parallel, there is a calculation formula: r=r1xr2 r1+r2 (this formula can only be used for parallel connection of two resistors, and the previous formula can only be used for parallel connection of multiple resistors).

Parallel circuit voltage characteristics: u total = u1 = u2 = ....=un。Parallel circuit resistance features:

1 r total = 1 r1 + 1 r2.

The formula for calculating the shunt resistance: current calculation. l total = l1 + l2 + .

ln is the total current equal to the sum of the currents passing through the individual resistors. Start-up voltage calculation. Total = U1 = U2 = ......The voltage at both ends of each branch of the un parallel circuit is equal and equal to the total voltage.

Resistance value calculation. 1 r total = 1 r1 + 1 r2 + 1 r3 + ...1 rn is the reciprocal of the total resistance is equal to the sum of the reciprocals of each sub-resistor, and for n equal resistors in series and parallel, the formula is simplified to r string = n * r and r union = r n.

Shunt Formula:

Let r1,r2 be connected in parallel, and the currents passing through them are i1 and i2 u1=u2 i1r1=i2r2 i1 i2=r2 r1 i1 (i1+i2)=r2 (r1+r2) i2 (i1+i2)=r1 (r1+r2) Let r1,r2 be connected in series, and the voltages through them are u1 and u2 i1=i2 u1 r1=u2 r2 u1 u1 u1=r1 r2 u1 (u1+u2)=r1 (r1+r2) u2 (u1+u2)=r2 (r1+r2) 。

Voltage division formula: supply voltage U Resistance value R1 of resistance 1, resistance value R2 of resistance 2 Total current i=u (R1+R2) Partial voltage on resistance 1 U1=IR1=UR1 (R1+R2) Partial voltage on resistance 2 U2=IR2=UR2 (R1+R2).

Principle of partial pressure. It means that in a series circuit, the current on each resistor is equal, and the sum of the voltages at both ends of each resistor is equal to the total voltage of the circuit. The formula of the partial pressure principle is r1:r2=u1:u2. Shunt in parallel circuits.

The principle of series voltage division: In the series circuit, the current on each resistor is simply equal, and the sum of the voltages at both ends of each resistor is equal to the total friction voltage of the circuit. Hu Pi can know that the voltage on each resistor is less than the total voltage of the circuit, so the series resistor divides the voltage.

If the two resistors R1, R2 strings and the hand are connected to a circuit with a voltage of V, then:

Current i=v (r1+r2).

The voltage at both ends of resistor 1: V1=IR1=VR1 (R1+R2).

The voltage at both ends of resistor 2: V1=IR2=VR2 (R1+R2).

So: v=v1+v2

Therefore, the string resistor circuit is called a voltage divider circuit.

If two resistors R1 and R2 are connected in parallel in a circuit with current I, then:

Total resistance r=r1r2 (r1+r2).

Total voltage v=IR1R2 (R1+R2).

Current at both ends of resistor 1: i1=v r1=ir2 (r1+r2).

Current at both ends of resistor 2: i2=v r2=ir1 (r1+r2).

So: i=i1+i2

Therefore, the shunt resistor circuit is called a shunt circuit.

Extended information: The total voltage at both ends of the series circuit is equal to the sum of the voltages at both ends of each consumer, i.e., u=u1+u2

u1∶u2∶u3=ir1∶ir2∶ir3=r1∶r2∶r3

p1∶p2∶p3=iu1∶iu2∶iu3=r1∶r2∶r3

Features of series circuits:

1. There is only one path for the current.

2. The switch controls the on/off of the entire circuit.

3. Mutual influence between electrical appliances.

4. The current of the series circuit is equal everywhere: i total = i1 = i2 = i3 = ......in

5. The total voltage of the series circuit is equal to the sum of the voltages everywhere: u original = u1 + u2 + u3 + ......un

6. The equivalent resistance of the series resistance is equal to the sum of the resistors: r total = r1 + r2 + r3 + ......rn

7. The total power of the series circuit is equal to the sum of the powers: P total = P1 + P2 + P3 + ......pn [derived: p1p2 (p1+p2)].

8. The reciprocal of the equivalent capacitance of the series capacitor is equal to the sum of the reciprocal capacitance of each capacitor: 1 c total = 1 c1 + 1 c2 + ......1/cn

In a parallel circuit, the voltage is equal between any two points where a wire is connected to the poles of the power supply. The current in each loop in a circuit is derived from Ohm's law:

The voltage of each resistor in a voltage parallel circuit is the same as the total voltage.

Advantages of series: In the circuit, if you want to control all the circuits, you can use the circuit in series;

Disadvantages of series: If one of the consumers in the circuit is broken, the whole circuit means that it is broken.

The advantages of parallel connection: one electrical appliance can be completed independently, and one electrical appliance is broken, which does not affect other electrical appliances. Suitable for street lights on both sides of the road.

Disadvantages of parallel connection: If the circuit is connected in parallel, the sum of the currents everywhere is equal to the total current, which shows that the current consumption in the parallel circuit is large.

If there is only one ideal power supply and this consumer in the circuit, then the electrical appliances can not be shunted by connecting a resistor in parallel, because the voltage at both ends of the electrical appliances and the resistor is equal to the voltage at both ends of the ideal power supply, and the current flowing through the electrical appliances does not become smaller.

The above ideal power supply refers to its internal resistance is zero, and the power supply in reality has some internal resistance, which will be connected in series with electrical appliances, both of which are divided into voltages, and the sum of the voltages of the two is equal to the total power supply voltage. At this time, the parallel resistance of the electrical appliance is smaller, the voltage at both ends of the electrical appliance becomes smaller, and the current flowing through it becomes smaller, and the shunt effect of the parallel resistor can be understood from this perspective.

In addition, there are cases where the power is supplied by a constant current source. A constant current source is a power supply with a constant output current. The constant current source is connected to this electrical appliance, and a certain current flows through the electrical appliance, and then the parallel resistor can be shunted.

Constant current source example: when charging the battery, in its constant current charging state, the charging current is certain, and the battery voltage will slowly increase with the increase of power, at this time it can be understood that the charging power circuit is a constant current source.

Let's give you an analogy, using a water pipe as an analogy, the flow of water in one pipe is only this big, and if you go in with the other, it will be quite double. The principle of resistors in parallel in circuits is similar. Resistance series voltage division, parallel shunt, these basic knowledge books are available, you can find some books to read.

One more resistor and one more path, so it can be shunt.

For example, the backbone current is 3 amps, and there are only two paths (with equal resistance) that are ampere. Add one channel, and each channel current is 1 ampere. That's shunting.

To use professional electrical theory, it is called Ohm's law of the whole line, and the more resistors are connected, the more shunts will be.

It turned out to be two branch roads, and the trunk circuit current was three amps. If one more branch is added, the main current will become amperere, and the current of the original two branches will not be reduced. How to divert it???