Why use a voltage tester to check that the socket has electricity, but the electrical appliances are

Use a voltage tester to check that the socket has power, but the electrical appliance does not work. What's going on?

Household appliances**.

I thought it was because:

1. The voltage measured by the voltage tester is the induced electromotive force.

2. The zero line of the line where the socket is located is broken!

3. The socket itself is faulty.

4. The electrical appliances may not be normal!

If you check it yourself, you'll be able to find the problem!

Be sure to pay attention to safety when looking for faults!

The test pen has electricity, and the electrical appliance is not energized, which is mainly a problem with the zero line, which may have the following two reasons. The first reason may be: where the zero line is broken, and the second reason may be: the zero line is virtually connected, I hope it can help you.

It may be that the electricity is induced, or the voltage is too low for the appliance to work. Check whether the socket wiring is in poor contact, loose, or falling off.

Pay attention to safety during the inspection, and it is best to check when the power is off.

In this case, if the electrical appliances are normal, it may be that the zero line of the socket is disconnected or the socket has a poor contact fault and is not connected to the power supply; The main faults are in the power and socket sections.

Use a test pen. Check that the socket has electricity, but the electrical appliance is not energized, indicating that the live wire of this socket is on, but the neutral wire is broken.

This situation is generally due to the failure of the neutral line or the failure of the electrical appliance. Troubleshoot the electrical appliance first, plug the electrical appliance into another socket to test or charge with a mobile phone charger in this socket, if it can be charged, it means that the electrical appliance is broken, and it can't be that the zero line of the socket is broken. It is necessary to check the socket neutral connector and wiring.

It may be that the neutral wire is broken, only the live wire, or the live wire or the neutral wire is connected virtually, causing the circuit to be unconnected.

If both jacks have a display of electricity, it means that the neutral line is disconnected, so the electrical appliance is not energized

Summary. Hello, it is best to use a multimeter to measure the voltage of the socket, which is the most accurate. The pen sometimes induces electricity, and the pen will glow slightly, but there is no electricity.

If the electric pen measures and the neon bubble brightness is normal, but the electrical appliance is not working, it may be the neutral line of the socket.

Hello, it is best to use a multimeter to measure the voltage of the socket, which is the most accurate. The pen sometimes induces electricity, and the pen will glow slightly, but there is no electricity. If the electric pen measures and the neon bubble brightness is normal, but the electrical appliance is not working, it may be the neutral line of the socket.

The pen test has power but the plug-in is out of power, the light bulb, and the TV are out of power.

It is possible that the neutral line of the socket is broken.

How can I fix it?

This can only check the line.

There is electricity in the electric pen, but there is no electricity in all parts of the house.

Check that there is electricity.

I checked the route, and there was electricity on the route.

The neutral live wire in the socket has electricity and the electrical appliance is plugged in and out of power, this is because the neutral wire is disconnected, and the live wire is conducted from the electrical appliances in the circuit (such as electric lights or other electrical appliances with unplugged plugs) to the neutral wire, so the measurement of the zero wire of the live wire has electricity. It is recommended to focus on checking the upper and lower terminals of the meter and the main switch, and re-tighten them if they are loose.

But the electricity at home cannot be used in the same way as if there is no electricity.

Generally, the zero line is broken, you check it.

Because the plug has a prevention function, only two holes can be inserted at the same time, and there is a chain function inside to prevent children from being electrocuted.

Now the socket and socket board have a jack oblique stopper, and the plug is round, and the stop can be pushed open with force. The voltage tester is inserted into a single hole, and it is more laborious to push open the baffle.

The safety socket must be plugged in at the same time in order to open the protective door, and the electric pen can not be opened with a single hole!

Electrical appliances can't work because there is no pathway, in other words, the zero line is broken.

Recently, a friend around me asked me that there was suddenly no power supply on the socket, and no electrical appliances could be plugged in. But after testing with an electric pen, I found that it can light up the electric pen, what is going on? First of all, we need to be clear about the usefulness of the electric pen.

What the electric pen is measuring.

The electric pen can measure electricity, so it is said, but what is the electric pen to measure? In fact, the function of the voltage tester is very simple, there is only one point - to measure the voltage!

When we test the circuit with an electric pen, the electric pen is lit up, and we can only be sure of one thing - there is a voltage on the line being tested. But can only the voltage circuit work? Apparently not.

There are two main points for a circuit to work, and both are indispensable

Key points of circuit work.

1.Voltage: Voltage provides "power" for the current, and the current can be generated to drive the electrical appliance;

2.Path: Only when the neutral live wire is turned on can the potential difference be generated, and then the current can be generated.

When we encounter the situation that "the pen test socket has power, but the electrical appliance cannot be used when plugged in", we can first know that there is a voltage in the circuit. Then the reason why the electrical appliance cannot work is because there is no path, in other words, the zero line is broken.

The most likely is that the binding post behind the socket is not properly connected or loose; In addition, it may be that the neutral line is broken or burned in the middle. However, the latter will cause the leakage circuit breaker to trip when plugged into the socket.

This often happens with newly installed sockets, and if you want to measure further, you can use the 250V position of the multimeter to measure the voltage between the zero live wires. Under normal circumstances, the measured value should be about 220V, if the voltage is too small or even not, you need to measure the voltage between the live wire and the earth (always the pen touches the live wire, and the other pen touches the earth) is about 220V, and you can conclude that the zero line is broken (if the voltage between the live wire and the earth is 0, you can only conclude that the live wire is broken, and you can not draw any conclusions under the zero line.) Of course, you can use this method when measuring the line of fire, or you can use an electric pen as above).

This is caused by the high resistance on the power supply circuit, and the problems are more in the fuse on the power supply circuit, the air open contact has a large contact resistance, the terminal contact of some devices on the line (air open, electricity meter, etc.) is poor and the line joint produces excessive connection resistance or virtual connection due to poor quality.

Is this a problem with the neutral line, the mixed line? If the live cable is not in good contact, check the connector and switch blades, fuses, leakage switches, etc. At the inlet line, tighten the screws, control its speed with an electric pen, turn on the switch, and when the light is not on, measure the two wires with an electric pen.

If the light is not on, the problem is in the front, and if the light is on, the fault is in the back.

The power supply is not faulty, that is the situation of the electrical appliance Under normal circumstances, it is unlikely that it will occur You should check the wiring of the electrical appliance to the power supply The most important thing is to check whether the contact between the electrical plug and the socket is intact It is not a problem with the electrical appliance. It was okay some time ago. It's not good now

This may be virtual electricity, which can be carried without connecting the equipment, and it cannot be brought when the equipment is connected. You can check whether the line is reliable.

There are two situations in which the electric pen test is charged at both poles of the socket:

First, control zero, open two or three plug-in lights connected to the live wire, with the zero line to control the switch hundred, this situation is called control zero, so I have to switch the two lines of the lamp.

Second, the ground wire is not well connected, the ground wire is not well connected to the wire, and the zero line is returned again by landing, at this time the electricity of the zero wire is very weak, but the electric pen will also be bright, as long as the ground wire is connected.

If there is still an electric pen that will light up after passing the work, you must ask an electrician to go home and check it to avoid accidents.

The fire line should be bright and the neutral line should not be bright. Measure the socket where the appliance is functioning normally.

1. Both holes are bright: it means that the zero line of the whole circuit is in poor contact. You have to find out the reason, otherwise you will burn the electrical appliances.

2. Only one hole is bright. The original measured socket has poor contact with the zero line. The fault is not related to the transformer. There is no such thing as a special socket for protecting the computer. There is only one type of uninterruptible power supply (UPS) that prevents sudden power outages from damaging the computer.

4. Under normal circumstances, the electric pen is 1 hole bright.

5,3 The upper part of the hole is grounded, the lower symmetrical left is the collar line is not lit, and the right is the fire wire is bright.

6. Reason 1, the drag strip or socket is faulty, your computer should be the drag strip fault, the tow strip is short circuited inside. Workaround: Replace.

Reason 2: The zero line is broken, this is the problem of the main line, the problem is in the place where your home enters the line, if the other equipment in your home is fine, then just the fault of this route. Solution: Line check.

The steps to use the electric pen are as follows:

Tools: pen, socket,

1. First of all, observe the electric pen, from top to bottom are the metal pen card, neon tube, resistor and metal nib.

2. Hold the pen posture. The posture of holding the pen is very heavy, and the hand must not touch the metal nib, there will be a risk of electric shock! The correct posture should be to hold the tip of the cap with the index finger and pinch the pen with the thumb, middle finger and ring finger.

3. Insert the metal pen tip into the socket, if the neon tube in the middle glows, it means that the socket has electricity; There is no light, it is recommended to test it a few more times, and if there is still no Lu Shidian, it means that the socket is out of power.

Precautions for the use of the test pen

1. Before using the tester, check whether there is a safety resistance in the tester, and then check whether the tester is damaged, whether there is moisture or water ingress, and it can be used only after passing the inspection.

2. Before using the tester to measure whether the electrical equipment is charged, check whether the neon tube can shine normally and shine normally before using the tester in the part with the power supply.

3. When testing the charged body in bright light or sunlight, pay attention to avoid light, in case the light is too strong to observe whether the neon tube is shiny, so as to cause misjudgment.

4. Most of the metal control heads in front of the voltage tester are made into the shape of small screws, when using it to tighten the screws, the force should be light, and the torque should not be too large to prevent damage.

5. After use, keep the tester clean and place it in a dry place to prevent falling.