How to Determine the Distance of a Parking Sensor?

Should the Car Battery's Positive or Negative Terminal Be Removed First?

When removing a car battery, the negative terminal should be disconnected first, followed by the positive terminal. Conversely, during installation, the positive terminal should be connected first, then the negative. If the positive terminal is disconnected first and comes into contact with any metal part of the car body, it effectively creates a direct connection between the positive and negative terminals, resulting in a short circuit that can damage the battery and wiring. Similarly, if the negative terminal is already connected and the positive terminal is being tightened, accidental contact between a metal wrench and the car body can also cause a battery short circuit. The same principle applies when jump-starting a dead battery—always connect the positive terminal first, then the negative. Electrical systems in cars operate on low voltage, direct current (DC), a single-wire system, and negative grounding. Low voltage and DC are straightforward—12V DC power supply. The single-wire system and negative grounding mean that the car's metal body serves as the common negative terminal for all electrical devices and is connected to the battery's negative terminal.

10

0

Share

Why is the car battery dead?

The reasons for a dead car battery include: 1. Forgetting to turn off the headlights after parking; 2. Using in-car devices for an extended period after turning off the engine; 3. Driving distances or durations that are too short. If the distance or time driven after each vehicle start is insufficient, the battery power consumed during vehicle startup cannot be replenished. This usage pattern can lead to a dead battery due to long-term insufficient charging. Additionally, aging of the generator belt can be a cause. The engine directly drives the generator via a belt, and the generated electricity is then rectified and voltage-regulated to charge the car battery. If the belt malfunctions, it naturally results in charging failure, necessitating timely replacement.

5

3

Share

How to Determine the Condition of a Car Battery?

Methods to determine the condition of a car battery: 1. Check the inspection port: The colors typically visible in the inspection port are green, black, and white. Green indicates sufficient charge, black indicates slight discharge, and white means the battery is dead and needs replacement. 2. Measure voltage: Use a battery tester or multimeter to measure the battery voltage. Under normal conditions, the no-load voltage should be around 13 volts, the full-load voltage should not drop below 12 volts, and the starting voltage should not be lower than 9.5 volts. 3. Inspect the appearance: Look for obvious swelling or bulging on the sides of the battery. Also, check around the battery terminals for any white or green powdery substances. If present, it indicates that the battery's performance is starting to deteriorate.

17

0

Share

What does min mean for car batteries?

Min for car batteries refers to the minimum value. A battery is a device that can convert chemical energy into electrical energy, consisting of a cup, tank, or other container or part of a composite container that holds electrolyte solution and metal electrodes to generate electric current. Batteries have positive and negative terminals. With technological advancements, the term battery generally refers to small devices capable of generating electrical energy. The main performance parameters of batteries include electromotive force, capacity, specific energy, and resistance. Using batteries as an energy source provides stable voltage, steady current, long-term stable power supply with minimal external influence. Batteries feature simple structure, portability, easy charging and discharging operations, and are unaffected by external climate and temperature, offering stable and reliable performance that plays a significant role in various aspects of modern life.

17

1

Share

What is the maximum speed of a 100h tire?

The maximum speed of a 100h tire is 210 kilometers per hour. The following explains the specific meanings: the number represents the maximum load index designed for the tire, and 'h' represents the speed rating. Passenger car wheels generally use radial tires. The specifications of radial tires include width, aspect ratio, inner diameter, and speed limit symbols. It is particularly important to note the aspect ratio, which refers to the percentage of the tire sidewall height relative to the tire width. Modern passenger car tires typically have aspect ratios between 50 and 70. The smaller the value, the flatter the tire shape. Both 'h' and 'v' indicate the speed rating of the tire, which is the maximum speed at which the tire can carry the specified load under specified conditions. A 100v tire has a maximum safe speed limit of 240 km/h. In addition, there are various other letters representing different speed ratings: Functions of car tires: They work together with the car suspension to cushion the impact during driving, ensuring good ride comfort and smoothness. They also ensure good adhesion between the wheels and the road surface, improve the car's traction, braking, and off-road capabilities, and bear the weight of the car. In daily use of tires, the following points should be noted: Regularly check the tire surface for cracks, deformations, or other defects. Due to driving wear, the tread grooves gradually become shallower. If the tread is worn flat, it will lose its drainage and anti-slip functions, significantly reducing the car's performance. Small cracks may seem minor but can be a hidden danger for tire blowouts at high speeds. Additionally, stones in the grooves should be promptly removed. Try to park on flat ground. Avoid parking on roads with thick, sharp, or pointed stones. Do not park near or in contact with petroleum products, acids, or other materials that may deteriorate rubber. After parking, the driver should not turn the steering wheel, as this operation will accelerate tire wear. Do not splash water to cool down. In hot weather or during high-speed driving, tires are prone to overheating, and the air pressure will increase. In such cases, park to allow the tires to cool down naturally. Do not release air to reduce pressure or splash water to cool down, as this may cause abnormal aging of the tread rubber. Avoid sudden braking. Try to minimize frequent use of brakes and emergency braking to prevent accelerated tread wear due to dragging between the tires and the ground.

19

0

Share

How Does Auto Water Damage Insurance Compensate?

Auto water damage insurance compensation methods: According to Ping An Auto Insurance, compensation is provided for engine damage caused by water submersion while driving, but only if the engine damage was not caused by a secondary start, as this would result in more severe damage to the engine and would not be covered. Below is an introduction to the coverage of various insurance types: 1. Theft Insurance: Covers damage to the vehicle during robbery or theft, including damage or loss of parts and accessories after the entire vehicle is stolen, robbed, or snatched. 2. Passenger Liability Insurance: Provides coverage for passengers, excluding the driver. 3. Water Damage Insurance: Covers losses caused by engine damage due to water submersion. 4. Spontaneous Combustion Insurance: Covers losses caused by fire originating from the vehicle's electrical system, wiring, fuel system, or gas supply system without external ignition sources. 5. Glass Breakage Insurance: Covers standalone glass breakage. 6. Scratch Insurance: Covers losses caused by intentional scratching of the vehicle.

1

0

Share

How to Determine the Distance of a Parking Sensor?

Should the Car Battery's Positive or Negative Terminal Be Removed First?

Why is the car battery dead?

How to Determine the Condition of a Car Battery?

What does min mean for car batteries?

What is the maximum speed of a 100h tire?

How Does Auto Water Damage Insurance Compensate?

Can Modified Steering Wheels Pass Annual Inspection?

How to Solve ETC Malfunctions?

Which city uses the Hai A license plate?

What are the consequences of adding diesel to a motorcycle?