Is there a voltage when there is no current, and what happens when there is voltage and no current

Yes, such as capacitors. After providing voltage to both ends of the capacitor, there will be no current after the capacitor is charged, but there is voltage on both sides of the capacitor. By the way, the capacitor is that the two insulated plates are separated but close together, and under the action of the electric field force, the positive charge is gathered on the A insulated plate, and the negative charge is gathered on the B plate, forming a uniform electric field, which is the charging of the capacitor.

At this point, the voltage across the capacitor is equal to the supply voltage, but there is no current.

The potential difference produces the voltage.

The voltage produces an electric current.

So. When there is no current, there is not necessarily no voltage.

But when there is no voltage, there must be no current.

The simplest example.

Is there voltage at both ends of the battery? Of course there is, but there will be no current between the positive and negative poles of the battery under normal circumstances, if there is, then the battery will leak, and it will not last long.

Yes, if you don't connect to the circuit before the power supply, there will be no current, but there will be voltage.

Yes As long as the circuit is not connected, there is no current, but there is voltage.

It depends on which position you measure, if it is a complete circuit, the wire section open, then there is a voltage at both ends of the section open; There is no voltage for wires with no segments.

When there is no current, there is not necessarily no voltage.

But when there is no voltage, there must be no current.

I'm speechless Why do you hold your head with your thumb with a voltage tester? It is because there is a large resistance on the tip of the voltage tester, and if you hold it down with your thumb, there will be a weak current through the human body, forming a path, and the light of the voltage tester will be on

The section of wire connected to the positive pole of the power supply has a voltage.

Otherwise, how does the voltage tester work

<> the situation that there is voltage and no electricity is a short circuit, the short circuit is a large current, and the circuit in the short circuit only says that its resistance is very small, even if there is resistance and current, there is also voltage. If the resistance in the short circuit is negligible, it can also be said that there is no voltage.

In the power system, the so-called "short circuit" refers to the connection between phases or between phases (or neutrals) outside the normal operation conditions of the power system. The basic forms of short circuit in the three-phase system are: three-phase short circuit, two-phase short circuit, single-phase grounding short circuit, two-phase grounding short circuit.

An abnormal connection (i.e., short circuit) occurs between phases or between phases (or neutrals), sometimes when a very large current flows.

Question 1: What happens if there is voltage but no current? The resistance is too large.

Question 2: What is the matter with voltage and no current The circuit has been opened. When a voltage is applied to a circuit that does not work, it is of course impossible to generate an electric current.

Question 3: Why is there voltage and not necessarily current? Even if it is a battery, if you short the positive and negative omens pole with the wire, the current of the wire is also very large, how can there be no inch current?

As long as the loop is on, there should be current, it's just a matter of size.

In addition, you can ask him who you heard about Lingchai orange!!

Question 4: Why is there not necessarily a current when there is voltage? There is voltage in the closed circuit before there is current, and there is no current when there is voltage float in the open circuit state.

But if there is no voltage, there will be no current, that is, there is a sufficient condition for a voltage to have a current, and there is a necessary condition for a voltage to have a current.

Question 5: Under what circumstances is there voltage but no current in the circuit, and under what circumstances is there current but no voltage in the circuit? If it is ideal, there is only voltage for an open circuit and only current for a short circuit.

The internal resistance of the battery is raised, or the internal resistance of the battery is too large. This noisy operation is measured with a voltmeter, because the internal resistance of the voltmeter is very high, the current through the voltmeter is very small, the potential of the battery consumes in the voltage of the internal resistance is also very small, the test result is close to the potential of the battery, and the normal battery voltage is very small, but because of the large internal resistance, it can not disturb the larger output current of the backup.

Ohm's law formula for partial circuits: i=u r, where: i, u, r - the three quantities are the current intensity, voltage and resistance at the same time in the same part of the circuit. When r is large, i is almost 0.

When we usually use various electrical appliances, we often encounter various problems, so how to solve them with voltage and no current?

1. How to solve the problem of voltage and no current.

Replace the battery or charge it.

It can be activated without current and charged to the battery with the same DC current as the battery's design voltage.

The original charger can not be charged, but the use of the same DC voltage as the battery design voltage can rush in, at this time the charging current will slowly decrease, after a few minutes it will be about the same as 0, the battery voltage can be restored to the design level and then stop charging, and then take a multimeter to measure the battery poles, to see if the voltage is normal.

The value of the cell voltage is lower than the rest of the cell, measure its actual voltage and then compare, if the value is higher, it is the same as the cell voltage, the standard of the actual value needs to be adjusted according to the LMU cell voltage sail slow, if the value is the same as shown, then manually charge the cell to keep it balanced.

Second, what are the precautions for charging the battery?

1. The temperature of each battery must be measured at any time during the charging process to prevent the temperature from being too high to affect its performance, when the temperature is 45 degrees, it needs to be paused, and then it can be continued when it drops below 35 degrees, and it can also be cooled by air cooling or water cooling.

2. The first charge should be carried out continuously, not for a long time.

3. When configuring and pouring the electrolyte, it must be operated according to the specifications and with appropriate utensils.

4. Ventilation equipment must be installed in the charging room, and the ventilation equipment can not be stopped during charging, so as to discharge harmful gases and avoid the danger of reducing damage to the human body.

I summarize: the above is the solution of voltage and no current, from the previous car blind article we can see that when charging the battery must be in accordance with the corresponding guidelines, so as to ensure that the struggle to charge at the same time to reduce the occurrence of danger, to ensure the personal safety of the owner, to avoid a lot of problems, I hope to help everyone.