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What is the principle of hydrogen fuel cells?

1 Answers

AlyssaLee

07/29/25 3:47pm

Hydrogen fuel cells operate on the principle of the reverse reaction of water electrolysis. Hydrogen and oxygen are supplied to the anode and cathode, respectively. The hydrogen diffuses outward through the anode, reacts with the electrolyte, and releases electrons that travel through an external load to reach the cathode. A hydrogen fuel cell is a device that generates electricity through the chemical reaction of hydrogen with oxygen (pure hydrogen combustion-driven "hydrogen internal combustion engines" have also existed, such as BMW's Hydrogen 7). The driving force of a hydrogen fuel cell vehicle comes from an onboard electric motor, similar to a pure electric vehicle. Therefore, a hydrogen fuel cell vehicle can be understood as an "electric vehicle with its own hydrogen fuel generator." Advantages of hydrogen fuel cells: No pollution: Hydrogen fuel cells are environmentally friendly. They rely on electrochemical reactions rather than combustion (gasoline or diesel) or energy storage (batteries). Combustion releases pollutants like carbon monoxide and particulates, while fuel cells only produce water and heat. No noise: Hydrogen fuel cells operate quietly, with noise levels around 55dB, equivalent to normal human conversation. This makes them suitable for indoor installation or outdoor locations with noise restrictions. High efficiency: The power generation efficiency of hydrogen fuel cells can exceed 50%, determined by their conversion properties. They directly convert chemical energy into electricity without the intermediate steps of thermal and mechanical energy (generators).

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What causes both the ABS and tire pressure lights to illuminate simultaneously?

The illumination of both the ABS and tire pressure monitoring system indicator lights indicates that the sensors in the vehicle's braking and steering systems have detected a malfunction, triggering the corresponding warning lights. A comprehensive inspection at a 4S shop is required to determine the exact cause of the vehicle's issue. Driving is not recommended when the ABS light is on: An illuminated ABS light signifies a malfunction in the vehicle's anti-lock braking system. During emergency braking, if the wheels lock up, the vehicle may skid uncontrollably, preventing the driver from decelerating or adjusting the vehicle's trajectory, which poses significant safety risks. Method to reset the tire pressure light: First, turn on the ignition switch, then press and hold the tire pressure monitoring reset button until a "beep" sound is heard before releasing. The tire pressure monitoring system will then store the current normal tire pressure data, automatically clearing the previous data. Finally, the dashboard warning light will turn off, completing the tire pressure reset process.

Should I Report to the Police if My Car Gets Scratched in the Residential Area?

If your car gets scratched while parked in a residential area, you should report it to the police. You can call the traffic police at 122 for assistance, or dial 110 to report the incident to the local police. Here are some parking tips for residential areas: 1. Park away from trees and balconies: When parking in a residential area, always be mindful to stay away from large trees and open balconies. In summer, tree sap, insect droppings, and bird droppings can corrode the car's paint and leave marks. During windy weather, flower pots, clothes racks, and other items on balconies may fall and damage the car roof, windshield, or paint. Therefore, it's best to park away from trees and balconies. 2. Avoid parking near garage doors or fire lanes: Garage doors and fire lanes in residential areas are no-parking zones, and drivers should avoid these areas when parking. To ensure unobstructed access for emergency vehicles, residential areas often have designated fire lanes, which are usually marked with special signs on both sides.

What is the latest admission time for the Dingtao Subject 4 examination?

To inquire about the latest admission time for the Dingtao Subject 4 examination, you may contact the Traffic Police Brigade. The explanation provided by the Traffic Police Brigade is as follows. Below is relevant information about Subject 4: Introduction: Subject 4, also known as the Subject 4 theory test or driver theory test, is part of the motor vehicle driver's license assessment. After the implementation of the "Order No. 139 of the Ministry of Public Security of the People's Republic of China," the Subject 3 examination was divided into two parts. In addition to the road test, a safety and civilization knowledge test was added, commonly referred to as "Subject 4," which assesses "driving ethics." Since this test is conducted after Subject 3, it is commonly called the Subject 4 examination. Officially, there is no designation as Subject 4. Examination Content: The test paper consists of 50 questions, primarily in the form of case studies, images, animations, etc. The total score is 100, with a passing score of 90.

What to Do When the Car Doesn't Supply Fuel During Ignition?

The solution to the car not supplying fuel during ignition is as follows: If the car's fuel pump is malfunctioning, it is necessary to promptly visit the car's 4S store or a repair shop to inspect or replace the fuel pump, which can resolve the issue of the car not supplying fuel during ignition. Below is relevant information about the car fuel pump: 1. Introduction: The fuel pump is a lightweight and compact pump, mainly categorized into in-line, distributor, and unit types. The fuel pump requires a power source to operate, and its lower camshaft is driven by the engine crankshaft gear. 2. Classification: (1) Injection type: The injection pump is primarily used in automotive diesel engines. The injection pump assembly is usually composed of the injection pump, governor, and other components installed together as a whole. (2) Self-priming type: Before starting the self-priming pump, fill the pump casing with water or ensure the pump casing itself contains water. After starting, the high-speed rotation of the impeller causes the water in the impeller channels to flow towards the volute, opening the inlet check valve, allowing air from the suction pipe to enter the pump and reach the outer edge through the impeller channels.

Should You Turn Off the Engine When Waiting at a Red Light?

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What procedures are required for the inspection of vehicle gas tanks?

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