3 Can a 9 volt battery burn out a 3 volt electrical appliance?

Definitely not, the rated voltage of the electrical appliance is generally much lower than the voltage when it is burned out, and the voltage difference of less than 1V should be no problem, otherwise it can only mean that the quality of the appliance is very poor. However, it is not possible to use voltages that exceed the rated voltage for a long time, which will shorten the life of the device.

Of course, it can be burned out, electrical appliances are very sensitive to voltage, if it is higher than the rated voltage, it will break down the electrical appliances and burn out the electrical appliances.

Generally, there is no problem, and the no-load voltage of a good dry battery can reach the knot. I used the board of my old mobile phone and put it on the radio myself, and it didn't do anything at all. The phone battery voltage is at least full enough to hope it can help you.

Not necessarily. How is the circuit of a 3V appliance designed? That is, its input voltage range.

If the input voltage range allows, it can be used normally

If the upper limit of the input voltage range is less, it cannot be used normally, but whether it will burn out depends on whether the appliance has a protection circuit.

It is best not to use it this way, there is a potential risk of burning.

Probably not, 3V appliances generally use batteries, and when the battery is fully charged, it will be a little higher than 3V.

Therefore, the ability of electrical appliances to withstand voltage must be higher than 3V.

However, it is difficult to say how high the voltage is.

This maybe, for example, a two-battery flashlight can easily burn out, depending on the allowable voltage range of the electrical appliance.

It mainly depends on the rated current of the electrical appliance, the current is small and easy to heat up, and the current is not easy to burn out.

It can be used, but it must be used after voltage stabilization, if the electric current is not large, it can be used after the voltage reduction can be used through the resistor, such as lighting the LED lamp can be connected in series with a 100 ohm resistor. If the current of the electrical appliance is large, it can be solved by using a stabilizer block. It cannot be used directly, and the input voltage of general electrical appliances cannot exceed 20% of the rated voltage, and if it is used directly, it will not burn out the electrical appliances.

No, it's 166% of the rated voltage, which is too high.

It depends on how demanding the power supply is from the consumer. The end-of-discharge voltage of CR2032 is that in fact, many devices are already inoperable when the battery voltage is lower.

Generally speaking, there are two types of rechargeable and non-rechargeable button batteries, including rechargeable lithium-ion button batteries (LIR series) and 3V rechargeable lithium-ion button batteries (ML or VL series). Non-charging includes 3V lithium-manganese button batteries (CR series) and alkaline zinc-manganese button batteries (LR and SR series).

This is because the power supply used by the user (one-phase live wire, one-phase neutral wire) is only taken from one phase of the three-phase electricity (three-phase live wire) provided by the substation. (The other two phases are provided to another user).

When the midline of the three-phase electricity supplied by the substation (the so-called midline of the three-phase four-wire system) is disconnected, it leads to a voltage imbalance among users of different phases. Some users have voltages above 220V (up to 400V), while others have voltages below 220V

According to your description, did the other users in that residential building have a voltage that was so low that the appliances could not be started?

So, the reason for this must be that the center wire in the circuit is disconnected! The responsibility lies with the substation!

Most likely there is a problem with the transformer.

i=u/r ！

Each resistor is different!

Let's use a digital meter.

Connected the zero line to the line of fire.

Yes! Because the voltage difference is too large, it will cause the motor to fly and cause serious wear (brushes)!

Because the coil of the motor does not change, the resistance does not change, and the current i=u r, so that the current becomes larger, and the coil is burned.

1. The simplest method: connect a current-limiting resistor in series and a 3V regulator tube in parallel.

2. Use a three-terminal adjustable voltage integrated block LM317 to adjust to 3V.

It is absolutely impossible to use it directly, because each appliance has its own voltage range, and the internal electronic components have their own normal working points, how can you increase to 300%? Basically, it doesn't work properly, and it may burn out at once. However, you must use this power supply, but you have to reduce the voltage, for example, spend about 2 yuan to buy a switch-type DC-DC buck module online and connect it to use.

No, it is easy to be damaged or even burned out with a higher voltage than the original.