Mobile phone owners often sin by not removing the charger from the outlet when it is no longer necessary to use it. Some wonder if this is dangerous or harmful. In principle, there is nothing wrong with the charger left in the outlet. And there are several reasons for that.
Consumed electricity
Some believe that since the phone is not connected, then the charger does not consume anything from the network, does not consume electricity. This is not entirely true. Despite the fact that the current strength of a simply plugged-in charger from a mobile phone is zero, electricity is still consumed. Just in very small amounts. For comparison: a 40 watt light bulb "twists" the same 40 watts per hour. The charger winds up only about 50 milliwatts per hour. Even the most economical and practical people can afford to leave the charger plugged in around the clock, since the monetary savings (electricity bill) will be only a couple of kopecks per month.
Safety
The instructions for the mobile phone and the charger for it clearly state that for safety reasons, a charger that is not working for its intended purpose must be disconnected from the network. What can actually happen if this condition is not met? Basically, nothing. Modern phone chargers are equipped with a built-in fire protection system. And there is nothing to burn in them, even if the device is constantly plugged into the outlet. But this applies only to high-quality chargers. If the device heats up even when it is simply plugged in (without a phone), it is advisable to turn it off anyway. It is possible that there is nothing to ignite there, but plastic can melt. Especially if it's low quality.
What is the risk
The reason why it is worth overcoming laziness or forgetfulness and still always unplug the charger from the outlet is power surges in the network. For example, if the power is suddenly turned off and then turned on again, the voltage in the outlet can increase from 220 V to all 380 V. Such a jump can render the device unusable or even cause a fire hazard.
In the summer, a great danger is the charger left in the socket during a thunderstorm. It doesn't matter if the mobile phone is connected or not. Firstly, lightning during a strike can disable any electrical appliance, regardless of the strength of the current consumed by it. Secondly, the charger may ignite after being struck by lightning, which is unsafe.
Surely each of you wondered, is it necessary to turn off the charger from the outlet? Moreover, it may not always be in a convenient place.
It can be much easier to plug it into the socket behind the bedside table once, bring the wire out and connect the phone to the connector from time to time.
Most are frightened by the consequences of what will happen if you keep the charge energized 24 hours a day. What are these myths and where do they come from, let's take a closer look.
Why do people generally turn off the charger? This is usually due to three main reasons:
Voltage imbalances, firstly, will disable charging, and secondly, they can cause a fire.
Once the device is plugged into the outlet, it means that it consumes electricity, although a little, but it still consumes electricity.
Any electrical device has a limited lifespan. And if it is constantly energized, then in a couple of years you will have to buy a new power source.
Safety
Modern chargers are not just a miniature transformer that steps down the voltage from 220V to 5V.
They have long been smart devices that have built-in protection against voltage surges. 
Pay attention to the case of your power supply. You will be surprised, but it is capable of operating in very wide ranges from the standard 220V. 
In high-quality blocks, the circuit has protection against overheating and short circuits. Such devices themselves are very difficult to burn. 
Also, do not forget that today in almost every second apartment, it is considered the norm to have a modular voltage relay in the switchboard. 
Of course, we have drops, but in 90% of cases they occur in private houses, powered by old power lines.
At the same time, they are made with bare wires, and not with insulated SIP wire. 
In urban high-rise buildings, such problems are much less common. The most likely reason that can burn your charge is a lightning strike in a 10kv or 0.4kv power line.
In this case, a short-term pulse of more than 1000 volts passes through the entire 220V electrical network. Even a voltage relay will not save him. 
The only thing that helps here is the use of other modern devices - SPDs. But for some reason, they are much less common in our country than the same UZO or UZM. 
Now just walk around the apartment and see what you have included 24 hours a day in addition to charging. Surely it will be:
- refrigerator in the kitchen
- boiler
- washing machine
But even despite the above danger of an overvoltage impulse, you do not pull out the plugs of these devices several times a day from the socket blocks.
Then the question is why this should be done with cheap charging, costing ten times less than everything else.
Moreover, there are also modern wireless chargers. 
They certainly never turn off and are always energized.
However, here you still have to make a reservation. At the moment, there are a lot of cheap fakes in a wide range. 
Inside such devices, you will not find high-quality components, and even more so some kind of smart protection.
These are the charges 100% you need to pull out of the sockets. Moreover, it is better not to use them at all. Even with normal voltage, they are capable of burning your phone. 
The main danger in them comes from capacitors. If one of them is located near the transformer, then it heats up. 
Subsequently, this heating leads to swelling and explosion. Also, the Chinese save on the copper wire of the transformer itself. As a result, such charges are heated, buzzing and vibrating.
When vibrating, the turns begin to rub against each other and the layer of insulating varnish is erased. An interturn closure occurs.
As a result, the output of the charger is no longer 5V, but 9-12-110, etc. The same capacitors are usually rated for 16V and, if overvoltaged, will explode so that the case shatters into small pieces.
That is why such devices should be bought only in company stores. When using them, which by the way are also made in China, but in completely different conditions and with quality control, you can safely leave the charger in the outlet.
To identify a faulty low-quality product, simply plug the charger into an outlet at idle without a phone. After a few minutes, go up to him and touch the body. 
If it gets hot, your charger is most likely defective. Be sure to turn off such a device, it should not warm up.
Also, it should not squeak at idle. This is also an indirect sign of an imminent breakdown.
And in order to 100% avoid problems in a severe thunderstorm with lightning, turn off not only the power source of smartphones, but also all other expensive equipment.
Even if your house has lightning protection and lightning rods. 
Lightning is still considered an unexplored phenomenon. And not a single expert will tell you how to save yourself from their side effects for sure.
Electricity consumption
Of course, if the device is energized at the outlet, it will eat electricity.
But it will be such a minuscule that if you turn off all other devices at once and leave only charging, your disk counter will not even move. 
For most of these metering devices, the sensitivity starts with a power of 5.5W. Your charger in idle consumes from 0.25 to 0.35 watts per hour.
Even if you take the maximum and do some small calculations, it turns out that with a tariff of 4 rubles per kilowatt, you will run up as much as 12 rubles in a year! This is one ruble per month. 
If you are a very economical person and this is critical for you, feel free to turn off the charging. With the money saved over three years, you can treat yourself to a doshirak. 
Working time
MTBF for modern chargers ranges from 50 to 100 thousand hours. This is approximately 5 to 11 years old.
Although, of course, in reality, the resource is always limited by the lifetime of electrolytes. And it is well below 50,000.
But even with a minimum period of 5 years, the charger must periodically also do its direct job - to charge the phone. 
Now remember the last time you changed your smartphone. This period was clearly less than or equal to 5 years. It turns out that you are more likely to buy yourself a new communication device than the power source from it will become unusable.
And we are not talking about the constant manipulations of turning the device on and off from the outlet, which cause harmful transients. 
They then become the most common cause of failure of electronic gadgets. Most accidents occur at the moment of switching.
And because of these frequent switching, the power cord near the case is constantly bent. As a result, the circuit of the device itself, although it remains working, but because of the breakage of thin wires in the wire, charging is thrown out. 
You can also remember about broken terminals in the outlet and possible sparking. There really is a real chance of a fire here.
Spark protection devices are just entering our home, and many still do not even know about their existence and purpose. 
Summing up, we can say that it is possible to leave what is called a permanent high-quality charger in sockets. Nothing will happen to him.
But if you are a suspicious, cautious person for whom safety always comes first and you are inadvertently familiar with Murphy's laws, unplug even the TV and refrigerator from the outlet.
And to recharge your smartphone, find a prominent place where there will be no problems with frequent disconnections from the network of its power source.
It has already become commonplace for every user to put the phone on charge before going to bed, thereby leaving it there until the morning. This applies not only to smartphones, but also, of course, laptops. By performing this action, the user receives the device with a full battery, which is necessary for offline operation.
Also, it is worth noting that most users, in the morning, simply take the device from charging, leaving the charger further in the outlet. This is done from a mass of motives: forgetfulness, time is running out, or simple laziness.
By doing this, a logical question arises: Is it correct to leave the charger in the socket?
To answer this question, you will have to consider the problem from different angles: technical, harm to the device and the charger itself, and, of course, savings.
Technically
According to safety regulations, the charger must be unplugged immediately after charging the phone. The charger left in the socket carries a small, but still a threat, both to the room in which it is located, and to the power supply to which it is connected. This is due to the fact that power surges, technical problems, which, in consequence, can cause the charger to catch fire, can occur in the power supply network.
Also, for security reasons, experts recommend charging any device only in the presence of the owner. If you still need to leave, then the best option would be to disconnect the charger from the power supply, that is, directly unplug it from the outlet.
Most attention should be paid to low-quality chargers, or to devices with malfunctions. They can bring no small harm to their owner, so it is strongly not recommended to use them.
Damage to the device
It is worth noting right away that high-quality, original chargers are designed for use all day long, so the average user will not feel a big difference in charging. But it's still worth mentioning.
When a device is left plugged in for a long time, it wears out, thereby losing performance. This happens both when equipment is connected to the device, thereby reducing the battery capacity of the equipment itself, and when only charging is connected to the power supply.
Saving
If the charger is connected to the mains, it still uses energy, regardless of whether a device is connected to it or not. However, the numbers are not that great, so from the point of view of savings, removing the charger from the outlet every time, the user will not save much.
As a result, I would like to say that leaving the charger in the outlet after the device is fully charged is everyone's business. This will not bring the user much cost or risk. The main thing is that the charging is of high quality and without flaws, in all other cases, using a failed product can cause great harm.
Do I need to unplug the charger? Sometimes we ask this question when we don’t want to crawl under the nightstand or bed and turn off the charger. All the same, in the evening you will have to put your smartphone on charge, and so every day, or rather every night.
What happens if you do not turn off the charger? How much does it "eat" electricity and is it dangerous?
Ask yourself why do you unplug your charger at all? Someone will say that for safety, they say, voltage drops can disable charging or even cause a fire. Someone will notice that once the smartphone charger is plugged in, it consumes electricity, which you have to pay for. But even the most meticulous will say that the resource of any device is limited, therefore, after a couple of years, charging will have to be thrown away. Let's look at each item in order.
Modern chargers are smart devices that have surge protection. Look at your power supply and you will be surprised to learn that it can operate from 100 to 240 volts, depending on the manufacturer. Branded chargers have protection against overheating and short circuit. So they are very difficult to burn. I live in the city and don't remember the last time there was a power outage. Perhaps if you live in a rural area and your electricity is turned off every day, then you should turn off the charging from the outlet.
Walk around the house. You have a TV, refrigerator, microwave, laptop plugged into the outlet around the clock. And I'm sure you don't unplug your washing machine after every wash. Moreover, modern wireless chargers are designed to be constantly plugged in for convenience. They put the phone on a pancake and he. Now they even produce furniture with built-in wireless chargers, so this direction will develop.
It is important to note here that now there is a lot of Chinese rubbish and fakes for well-known brands on the market, in which the cheapest components are used to save money and there are almost no protections. Such power supplies not only need to be unplugged, but it is better not to use them at all, as they can damage your smartphone.
If you use branded original chargers, then you can safely leave them in the outlet, if, of course, it is convenient for you. To cast aside all doubts - plug the charger into a power outlet and after five minutes check if it heats up? If there is heating, it is possible that your charger is faulty, be sure to turn it off, it should not warm up. But even in a severe thunderstorm with lightning, it is better to turn off the charger, although now all houses have grounding, and power lines have lightning protection.
Without a doubt, once the device is plugged into the outlet, it consumes electricity, but so scanty that if you turn off all appliances and leave only charging, the electric meter will not even spin. Since the sensitivity threshold for most modern meters is 5.5 watts. A charger in idle mode consumes from 0.25 to 0.35 watts. If you calculate the cost of electricity, you will get no more than one ruble per month, and then if the latest meter is installed.
MTBF of modern chargers ranges from 50 to 100 thousand hours. If you take it to a minimum, it turns out that for six years the charger must not only be plugged into the outlet, but also periodically it must charge the smartphone. Not so much, to be honest, but these are the minimum calculations. So you will quickly change the smartphone itself than the charging will fail.
It is also important to note that the constant switching on and off of the charger causes harmful transients that can cause damage. After all, most problems occur at the time of switching. So from the point of view of the resource of work, charging must be left in the outlet.
In general, live as you like, if you want, you can leave the charger in the socket and nothing will happen to it. If you are comfortable, you can turn off the charger if in doubt. After all, this device serves people, not people devices.
A charger for modern electronics is in every home. Is it safe to leave the charger in the outlet?
Educational and production processes are impossible without the use of tablets, phones, laptops and other gadgets. These devices require the batteries to be kept charged by means of chargers. Almost all users have more than one such device: in a bag, in a nightstand, by the bed, in the kitchen. And few people at the end of use pay attention to its complete shutdown, often it remains in the outlet. And is it safe?
How to safely use your phone charger
Leaving anything plugged into an outlet unattended is in itself a fire safety violation. One of the most common causes of fire is a short circuit. The average consumer is unlikely to know that something is wrong with his charger. Most people simply shrugs their shoulders at the excessive heating of the device case, explaining this by the usual energy consumption.
By the way, this state is normal, provided that the charging process is being carried out. If the gadget is already turned off, then the heating of the charger indicates a malfunction of the device.
This can lead to melting of the plastic of both the device itself and the outlet housing. Ignition and short circuit in this case are quite expected. Even if the charger does not heat up at all, the risk of a short circuit still remains (for example, during a power surge).
It is because of power surges in the network that experts do not recommend leaving their gadgets on charge all night. Both the charger itself and the gadget that “feed” with it can break down.
If you have a power surge protection filter or the gadget itself is equipped with this function, then you don’t have to worry, power outages will not harm the device being charged.
Many people say that leaving the phone (laptop, tablet) connected to the outlet after it is fully charged, we significantly reduce the resource of the battery itself, and, consequently, the “life” of the gadget. This statement causes a lot of controversy on the Internet. Proponents of turning off the gadget immediately after charging justify their action by protecting the battery. Opponents, on the other hand, say that on average people change their gadgets every two years, and during this time the battery will be enough, so there is no point in “bothering”.
In addition, all modern devices are equipped with built-in controllers, which, after charging, stop supplying energy to the battery, preventing it from “overflowing”. Therefore, if you do not have an old gadget, you can not track the moment it is fully charged, but if your device gets very hot both during the charging process and after it is over, then it makes sense to disconnect it immediately.
And one more aspect: when the charger is not disconnected, electricity consumption continues. Of course, it is negligible, up to 3 watts per hour, in monetary terms, these are mere pennies. But if there are several such chargers in an apartment, not to mention an apartment building or office, then you should think about extra expenses.
It would be useful to unplug the charger from the outlet if you have boredom nibblers in your house (dogs or cats). It is better if they gnaw through the wire, which will not be supplied with any voltage.
To avoid a variety of problems associated with chargers, you just need to get into the habit of turning them off and all unused devices: phones, tablets, laptops. By following these recommendations, the risk of trouble will be minimized. published
If you have any questions on this topic, ask them to specialists and readers of our project.