In a parallel circuit, the resistance of a branch becomes smaller, and the voltage becomes 5

Parallel circuits. , each circuit is independent of the other. The resistance of one of the circuits becomes smaller, while the total voltage remains the same, so the current of that circuit increases, and so does the total current.

As for the voltage, if that part of the circuit is independent, then the voltage is related to the applied voltage. If the part of the parallel circuit is in a series circuit.

, the total resistance decreases, the distributed voltage decreases, and the voltage of each branch decreases.

Summary: In parallel circuits, each circuit is independent of each other, and the voltage depends on the whole.

In a series circuit, the voltage is proportional to the resistance, and the greater the resistance, the greater the voltage of that part. But the current is the same.

In the parallel circuit, if there are two resistors R1 and R2 connected in parallel, the condition is: the total voltage of the whole circuit is unchanged, and the voltage of the parallel circuit is equal. When the resistance of one branch becomes smaller, the resistance of the whole circuit becomes larger from the calculation formula of the parallel circuit, and the total current becomes larger, and it can be seen that considering the internal resistance of the power supply, the voltage distributed by the external circuit becomes smaller, so the external voltage becomes lower.

In parallel circuits, the resistance of one of the branches becomes smaller, the total resistance becomes smaller, the voltage does not change, the total current becomes larger, and the current of this branch becomes larger.

This is a dynamic analysis problem of circuits! Let's be more specific!

In a parallel circuit (if all resistors are connected in parallel and the supply voltage is constant), the resistance voltage of the branch is increased and does not change.

In the parallel circuit (if several resistors are connected in parallel, and other resistors are connected in series), the branch resistance is increased, and the branch voltage becomes larger.

In a parallel circuit (if all resistors are connected in parallel, and the internal resistance of the power supply is considered), the branch resistance is increased, and the branch voltage becomes larger.

The trunk current will be smaller, in fact, it is very simple, the branch resistance will be larger, the total resistance will be larger, the voltage will not change the total current will be smaller, and the trunk current is the total current, which will also become smaller.

When the resistance of one of the branches in the parallel circuit increases, the parallel equivalent resistance value increases. Then when it is connected in series with the trunk resistor, it becomes larger, and the trunk current will become smaller.

The voltage divider in series and the shunt in parallel, so the current should be reduced.

When parallel bai

A branch of the electrical circuit.

When the resistance is large, the trunk current will be smaller.

Parallel circuit DAO: The power circuit connected to the end of the circuit metaplate is called the parallel circuit;

Resistance: The dampening effect of a conductor on an electric current is called resistance and depends on the length of the conductor, the material, the cross-sectional area, and the temperature outside. where the resistance is proportional to the length and inversely proportional to the cross-sectional area.

When the branch resistance increases, it is equivalent to a thinner or longer resistance, which will lead to an increase in the total resistance, and when the voltage is constant, the total resistance increases, and the total current - the trunk current - will become smaller.

The current of the branch and trunk road becomes smaller.

A larger resistance value of any branch in the parallel copy circuit will lead to a decrease in the total current of the trunk line, because:

1. According to Ohm's law, the branch current i is equal to the voltage u divided by the resistance r (i = u r). The voltage U of the parallel circuit is equal everywhere, so the increase of the resistance of any branch will cause the current of the branch to decrease.

2. According to KCL, the total current is equal to the sum of the currents of each branch, so the change of the current of any branch will affect the total current.

In summary, the total current of a branch will become smaller because the resistance of a branch becomes larger, and the total current of the trunk line is the sum of the currents of each branch, so the total current of the trunk line will become smaller.

From the calculation formula, after parallel r=r1·r2 (r1+r2), then 1 r = (r1+r2) r1 r2=1 r1+1 r2>1 r1 also1 r2

i.e. 1 r>1 r1; 1/r>1/r2

r From the imagination analysis, a large group of people crossing a single-plank bridge, the resistance must be great, and another bridge, even if the bridge is not easy to walk, there are some people who can cross, so the overall efficiency of crossing the river is not improved, and the obstacle is not smaller?

According to the relationship between the total resistance and the sub-resistance of the parallel circuit:

1 r total = 1 r1 = 1 r2 + .1 rn assumes that r1 becomes larger, 1 r1 = 1 r2+...1 rn becomes smaller, 1 r always becomes smaller r always becomes larger.

So, when one resistance of a parallel circuit becomes larger, the total resistance becomes larger.

When one resistance in a parallel circuit increases, the total resistance increases. We can tell by the changing current, when one of the resistance of the branch becomes larger, then the current of the branch will be smaller, and the total current will also be smaller. According to r=u i, only r becomes larger, so the total resistance becomes larger.

The parallel voltage remains unchanged, there are more branches, and the branch current is ix=u rx, then the total current is i=i1+i2+.ix, one more branch, the sum becomes larger, and the total current becomes larger.

Then we can find the total resistance using the parallel voltage and the parallel current.

r=u ii is increasing, but u is unchanged, then r is decreasing, so parallel circuits.

When a resistor is added, the total resistance becomes smaller and the trunk current increases.

The reciprocal of the total resistance of the parallel circuit is equal to the sum of the reciprocal resistors of each branch. As the branch resistance increases, the reciprocal of the total resistance decreases, while the total resistance increases.

According to =u r, when r increases when u does not change, i becomes smaller. So the trunk current becomes smaller.

Through the branch resistance, the total resistance is calculated, and the branch resistance increases, and the total resistance increases.

If the voltage is constant, the total resistance increases and the trunk current decreases.

1. Increase the branch and increase the current of the trunk road.

2. Increase the resistance in the branch and reduce the current in the trunk circuit.

The branch resistance increases, the total resistance increases, and the trunk current decreases.

The relationship between the total resistance of the parallel circuit and the resistance of the branch (1 r = 1 r1 + 1 r2 + 1 r3 +.1 rn) can be inferred that in a parallel circuit, when the resistance of the branch increases, the total resistance of the parallel increases with it, and vice versa.

According to this inference, in a parallel circuit, the branch resistance increases, and the total resistance of the parallel circuit also increases. When the supply voltage is constant, the total current (dry current) decreases.

First, make sure that the supply voltage is fixed, then ignore the resistance of the wire, and then make it clear which object the voltage, current, and resistance are all aimed at in your question.

1.In parallel circuits, the resistance changes, the voltage of course does not change, the voltage is a fixed value, and the change is the current.

2.In a series circuit, the resistance of a certain part increases, the voltage at both ends of the corresponding part increases, the total current of the circuit decreases, and the total voltage remains unchanged.

3.A small current and a small voltage are not necessarily small because the resistance can be large; In the same way, if the current is large, the voltage is not necessarily large, and the resistance may be small.

4.Regardless of whether the circuit is connected in series or parallel, the relationship between the three is U=IR, that is, the voltage is equal to the current multiplied by the resistance. The only difference is that the resistance of parallel circuits is calculated differently than those connected in series.

When the power supply is constant, the change of resistance in the parallel circuit will not affect the voltage of each branch.

The voltage at both ends of each branch in the parallel circuit is equal, yes, there is no contradiction, in the series circuit, the resistance increases, will the voltage increase?

If there are two or more resistors connected in series, and one of the resistors becomes larger, the voltage at both ends of the resistor will increase.

Is the voltage small if the current is small, and the voltage is high if the current is large?

If the resistance is unchanged, the current is small, the voltage is small, and the current is large, and the voltage is large. What about parallel circuits?

At any time, the relationship between the three is: i u r

If this parallel circuit is directly connected to the two poles of the power supply, the voltage will not change, which is the power supply voltage. If it is connected in parallel and connected in series with other resistors, the voltage at both ends of the parallel resistors will decrease because the total resistance of the parallel connection becomes smaller.

In a series circuit, the resistance is large, and the voltage is large, but in terms of the entire circuit, no matter how the resistance changes, the total voltage is always equal to the supply voltage. In this case, the current decreases due to the increase of resistance.

Is the voltage small if the current is small, and the voltage is high if the current is large? It is not said whether the resistance is constant or not, and of course it cannot be said that way.

In a series circuit, the current of each resistor is equal, and if the resistance is large, the voltage is also beaten. In parallel circuits, the voltages of all resistors are equal, and if the resistance is large, the current is small.

This depends on whether there are other electrical appliances on the main road, if there are other electrical appliances, then the voltage of each branch is to become larger. Otherwise, it doesn't change.

As the resistance increases in a series circuit, the voltage across the resistor increases.

It cannot be said that if the current is small, the voltage will be small, and if the current is large, the voltage will be large. This depends on whether the resistance in the circuit changes, if the resistance is constant, the current in the circuit is small, which means that the voltage of the circuit itself is small.

Regardless of whether it is a series circuit or a parallel circuit, all three satisfy i=u r