Why should cars have low voltage 15 electricity and 30 electricity.

15 electricity is ON gear (the key hits the ON gear), 30 electricity is constant electricity (directly connected to the battery), because the needs of each electrical appliance are different, so the two lines of electricity will be separated.

The battery is the power of a car, the battery is very important for the car, when the engine is not started, the battery supplies power to the electrical equipment of the whole car, after starting the engine, it is the generator to supply power to the electrical equipment of the whole car, and the generator can also charge the battery, if the battery is dead, the engine can not be started.

Automotive voltage precautions.

The performance of battery storage and discharge will be reduced due to use, which will directly or indirectly cause other electronic equipment of the vehicle to fail due to power failure and current instability; As a result, the ignition voltage of the battery is insufficient, resulting in a start-up failure or multiple start-ups. Therefore, whether before the trip or after the drive, the condition of the battery should be carefully checked. If necessary, you should go to the 4S point for charging and maintenance.

The maintenance of the automotive circuit system is one of the core contents of automobile maintenance, especially for vehicles that have been used for more than three years, because the circuit system may be aged in advance due to improper use, scratches, etc., so it is very important to go to the repair plant every year to carry out a thorough overhaul of the automotive circuit system.

The starting voltage of the car should be a 12-volt battery as if it was a 12-volt battery, I have not heard of it, 15 or 30 electric 12 volts or 24 volts to move the car.

The gears of an automatic transmission in an automobile.

Generally speaking, automatic transmissions are divided into P, R, N, D, or L, etc. P (parking): Used for parking, it uses a mechanical device to lock the car.

Turn the part so that the car cannot move. When the car needs to stay in a fixed position for a long time, or before leaving the vehicle after stopping, the hand brake should be applied and the paddle lever should be pushed into the "P" position. It should be noted that:

The vehicle must not be used until it is completely stopped, otherwise the mechanical part of the automatic transmission will be damaged. In addition, the automatic transmission car is equipped with a neutral start switch, so that the car can only start the engine in the "P" or "N" gear, so as to avoid the car suddenly moving forward when starting in other gears.

r (reverse): reverse, used for the vehicle to reverse. It is usually necessary to press the safety button on the lever to move the lever to the "R" position.

It should be noted that when the vehicle has not completely stopped, it is absolutely not possible to force the vehicle to turn into "R" gear, otherwise the transmission will be seriously damaged.

n (neutral): neutral. With the paddle in "n" gear, the power between the engine and the transmission has been cut off and separated. For a short pause, you can place the paddle lever in this gear and pull the hand brake lever, and take a break with your right foot off the brake pedal.

D (drive): Forward gear, used for general road driving. Due to the different designs of the models in different countries; Therefore, the "D" gear generally includes from 1st gear to high gear or 2nd gear to high gear, and will automatically change gears due to changes in vehicle speed and load.

By placing the paddle lever in "D" gear, the driver can control the speed of the car as long as the accelerator pedal is controlled.

The voltage of the car is 12V power supply, and the output voltage is about 14V after the engine starts, and the output voltage can be increased through the on-board inverter, but because the current insurance of the cigarette lighter is limited to 15A, it is not suitable to use electrical equipment with a power of more than 100W!

Low voltage:

ULV processor, English name: Ultra Low Voltage, Chinese translation: Ultra Low Voltage Version.

After Intel adopted a new naming convention, the processor model is composed of a prefix letter and four digits, such as: core 2 duo e6600 and so on. Among them, the prefix letter in the number represents the range of TDP (Thermal Design Power Consumption) of the processor, there are currently four types such as E, T, L and U, "E" represents that the TDP of the processor will exceed 50W, mainly for desktop processors; "T" represents the TDP of the processor between 25W-49W, and most mainstream mobile processors are T series; The "L" represents the TDP of the processor between 15W-24W, which is the low-voltage version; The "U" represents the processor's TDP below 14W, which is the "ultra-low voltage version" discussed in this discussion.

To trace the development of the "ultra-low voltage version of the processor", we need to start from the Pentium era. In order to distinguish the mobile version of the Pentium with the Coppermine core, Intel renamed the new mobile version of the Pentium with the Tualatin core to "Pentium -M" in early 2002, which is also the origin of the practice of adding "M (Mobile)" to the logo of the notebook processor to indicate that it is the "mobile version".

However, two of the most anticipated versions of the ULV processor were born in 2001, namely the Mobile Pentium 500MHz and the Mobile Celeron 500MHz. With the upgrading of notebook processors, the ULV processors that can be seen at present are basically products that use core architecture processors, dual-core U2400 and U2500 and single-core U1300, U1400 and U1500, all of which are the highlights of ULV processors' major invasion of the mobile processor market.

With the latest dual-core "Core 2 Duo SU9600" and single-core "Core 2 Solo SU3500", Intel's UVL family members are already very powerful. Intel's latest plan based on the ULV platform is divided into three parts: the initial mastery single-core Celeron ULV, the performance-level single-core Core 2 Solo ULV, and the performance-level dual-core Core 2 Duo ULV.

It can be seen that since the beginning of 09 years, ULV processors will be more diversified, and at the same time, with the gradual update of products, the ** of its related products will also be more intimate and satisfying.

If there is no variable low-voltage electricity, the high-voltage coil cannot induce high-voltage electricity.

The low voltage is used to drive the control circuit of the ignition system, and at the same time the high voltage coil is used to raise the low voltage to high voltage for ignition!

The 12V or 24V power supply system is generally used in the car, and the 24V power supply system is generally used in the larger power diesel vehicles.

Low voltage is safer, the use of the battery in the car and the use of the battery car is not the same cost-effective, a battery is easy to maintain, there is no need to install more, a battery can already meet the needs of starting.

Theoretically, if you are below volts, you can't catch fire, and if you are below volts, it's not easy to catch fire. Generally, it should not be lower than volts. It needs 12 volts to be normal after the fire, because the generator starts to charge the battery after the fire.

Because the DC energy is stored in the battery, it can be used even if the car is not started. The alternating current should also be turned into DC storage, and the AC equipment should be changed back when it is used, increasing the cost.

DC has good stability relative to AC. And the DC power can be stored by the battery for backup.

Haha, it's easier to get and store, and there are a lot of electronic devices in cars now, and DC is the most suitable for powering electronic devices.