While gas-powered engines typically have 2,000 moving parts, electric vehicles have about 20.

The average electric vehicle motor has about 20 moving parts

The simpler design significantly reduces the energy lost to heat compared to the approximately 2,000 parts in a gas-powered car. Pollution is also lower, though an EV's emission profile is only as clean as the electric utility it's plugged into.

Battery and plug-in hybrid EVs can operate with zero tailpipe emissions

Battery electric vehicles only run on electricity, while plug-in hybrids incorporate a small internal combustion engine that recharges the battery or directly powers the wheels to improve driving range. Fuel cell electric vehicles convert hydrogen gas fuel into electricity.

Electric vehicles have been around since the 19th century

The first EVs ran on rechargeable lead-acid batteries, which could travel 60 to 80 miles on a single charge. Women preferred these vehicles, which were quieter, less smelly, and did not require turning a hand crank to start the engine.

Internal-combustion engines convert fuel into motion using controlled explosions

Gasoline engines mix fuel and air, compressing it and igniting it to create thousands of tiny explosions that push pistons up and down. This movement spins the crankshaft, which moves a vehicle's wheels.

Despite electric usage concerns, EV charging accounts for less than 1% of grid load

Other popular myths about EVs include battery failure concerns—failure rates are less than 1% on newer models—and that there are no places to charge cars, though both at-home outlets and more than 77,000 stations on the road are available.

Explore an interactive graphic of a wind turbine's components

Wind turbines contain a gearbox that increases the rotation of the blades by a factor of 100 from low to high-speed shafts. The latter moves magnets that change the magnetic field within a generator, creating electricity.

Charging an EV depends on power source, charger type and battery size

It takes less time to charge an electric vehicle's battery for Level 3 chargers, which can deliver 80% capacity in as little as 30 minutes. Level 1 chargers can take days. Larger vehicles possess larger batteries that increase charging time, despite often having less range.

Explore the human and environmental resources needed to make an electric vehicle

The minerals needed to build batteries for electric vehicles are expensive and often take a human toll paid by the communities where they are mined. This interactive article details what minerals make up an electric vehicle battery, where they come from, and dangers posed by the mining process.

Nearly 40% of American cars were electric in 1899

They were most common in cities, where battery swap stations allowed drivers to "refuel" their vehicles reliably. Innovations in combustion engines caused electric cars to lose ground until environmental policies and advances in battery technology revitalized interest.

Explore a gallery of electric vehicles from before 1920

In 1884, Thomas Parker invented the first practical electric car in London. By the turn of the century, early EVs were seen on the streets of Washington, DC. Automaker promotional materials included photographs of cars on mountain roads and other terrains.

The engineering underlying the electric grid and why it needs to be modernized

The system includes generators for producing electricity and millions of miles of transmission and distribution lines to transport the energy. The substantial increase in the number of electronic devices and electrical demand since the construction of much of the grid in the mid-1900s has strained infrastructure, requiring continuous upgrades and massive investments in new construction.

High fuel prices and fuel shortages revived dormant interest in EVs

Electric vehicles, in the form of motorized carriages, predate the invention of the gas-powered automobile by over 40 years. The latter's affordability made it more popular until technological advances made EVs more viable to consumers in the early 2000s.

Audi spent over three years developing engine sounds for its electric vehicles

Unlike the sounds made by combustion engines in gas-powered vehicles, electric cars produce no motor sounds. The company's acoustics team worked with composer Rudolf Helpmier to craft an electric-inspired revving sound for its R8 e-tron supercar.

Growing EV adoption requires battery management infrastructure

Despite rechargeable batteries' limited life cycle, companies like Spiers New Technologies have developed methods to repair, refurbish, repurpose and recycle these components to minimize environmental waste, lower demand for new critical minerals, and increase electric vehicle lifetimes.

As of 2025, most EV batteries retain 95% or more of their range after three years

Data from over 30,000 electric vehicles shows that their batteries are lasting much longer than initially projected, which researchers suggest is due to improved battery management systems and real-world use often being less rigorous than high-performance testing. Cars with 150,000 miles or more that have not had a battery replacement retain at least 83% of their original range.

Batteries range in size based on their purpose, cost, and manufacturability

Lead-acid batteries used in combustion vehicles are resilient to temperature extremes, low-cost, and provide high surge current, which is needed for initial ignition. Alkaline batteries, including AA, AAA, and B, have long shelf lives and supply the low, steady power required for electronics with minimal demand fluctuations.

Hydrogen vehicle adoption has struggled due to high costs and stiff EV competition

Despite features like fast refueling and zero emissions, hydrogen vehicles face significant hurdles in affordability and infrastructure. As of 2025, there are about 200,000 electric vehicle charging stations compared to fewer than 100 hydrogen fuel ones.

Fire engines are among the most complex vehicles on the road

These vehicles are purpose-built to carry water, foam, hoses, ladders, and lifesaving equipment to a scene in minutes. This animated video pulls apart every system inside a pumper truck, showing exactly how the machinery that fights fires actually works.

How lithium has become one of the world's most important elements

Lithium is the driving force behind electric vehicles as the key element in the lithium-ion batteries that power the cars. But as demand for EVs rises, will global lithium supply keep pace with demand? This report projects demand will reach up to four million metric tons of the mineral compound containing lithium by 2030, with batteries accounting for 95% of end-use applications.

Watch a timeline of the history of electricity, from observations of static electricity in antiquity to the War of the Currents—a rivalry to establish the ideal system for electric grids.

Tesla's alternating current power's most of the world's electric grids

In 1879, Thomas Edison’s light bulb relied on direct current, but such currents can't efficiently transmit power over long distances. Nikola Tesla introduced alternating current, which feature far fewer energy loses. Despite Edison’s attempts to discredit AC, Tesla proved its efficiency by lighting the 1893 Chicago World’s Fair.

The hidden engineering of gas stations

Contemporary gas stations are the result of a century of engineering progress. In the early 1900s, only a few thousand cars drove around, and they used kerosene. As vehicles and cheaper gasoline became more popular, fire hazards grew, forcing the invention of fuel pumps, underground storage tanks, and the automatic shutoff valve—all engineering marvels.

Explore the components of autonomous vehicles controls

A suite of cutting-edge hardware and computation-intensive software creates the potential for self-driving cars to be safer, more fuel-efficient, and more accessible to a broader range of drivers. However, automation also introduces potential cybersecurity threats.

As of 2024, 13 states have plans to phase out gas-powered cars

In 2022, California adopted the Advanced Clean Cars II Act, which requires all new passenger cars, trucks, and SUVs sold to produce zero emissions by 2035. Other states adopted similar laws, joining more than 50 countries with phaseout plans.

Electricity is produced when the ends of a battery are connected by a conducting wire, triggering chemical reactions that release the energy stored in chemical bonds.

View the five most expensive metals used to make batteries

Before 2021, when lithium carbonate became the most expensive metal for use in electric vehicle cathodes, cobalt was the most costly battery metal. Of the top five, copper is the only metal not used in cathodes, arguably the most important part of the battery, which determines performance, longevity, and range.

US EV sales grew from 1.4 million vehicles in 2023, to 1.7 million in 2024

California, Florida and Texas have the highest number of electric vehicle registrations in the US, while Mississippi, North Dakota and West Virginia have the lowest. Charging station infrastructure, high costs, and range anxiety contribute to lower adoption rates.

Acoustic Vehicle Alerting Systems provide motor sounds in electric vehicles

Since 2019, various global standards have set requirements for these systems, which seek to mimic combustion-engine sounds by meeting specific sonic criteria, including sound pressure, frequency, and pitch. Sound engineers design these systems to meet these requirements, ensuring that passers-by, particularly the blind and visually impaired, can detect the presence of a vehicle.

More batteries in the power grid would create an on-demand energy reservoir

Most power grids are inefficient because they require enough generation capacity at all times to avoid blackouts. This means at any given time, as much as 50% of generating capacity at power plants can go unused. Batteries would reduce this inefficiency and allow for real-time adjustments.

Visualize how alternating currents—electricity that periodically changes direction—are generated by rotating magnetic fields, as occurs in turbine-generator systems.

Learn why electrical substations are needed to provide safe electricity with minimal energy loss

These typically fenced-off facilities with steel boxes or cylinders topped with cone-like caps house circuit breakers, fuses, and switches that can isolate sections of the grid to prevent electrical failures from spreading. Substations use transformers to modify electrical voltage and are customized to the generation, transmission, and distribution networks they interconnect.

As of January 2025, Tesla is the second best-selling EV company in the world

Chinese automaker BYD saw nearly three times as many registrations of electric vehicles as Tesla through the sales of its plug-in hybrid and battery electric vehicles. Fellow Chinese competitor Geely sold 12.7% of all BEVs worldwide, surpassing Tesla's 12.4% share during the same period.

On average, the human body produces about 100 watts of electricity—enough to power a light bulb—but some people can produce over 2,000 watts in short bursts, such as when sprinting.

A pair of engineers began Tesla to prove the viability of electric vehicles

Martin Eberhard and Marc Tarpenning sought to design a high-end electric sports car for environmentally motivated, affluent buyers. The Tesla Roadster would be the first highway-legal car to use lithium-ion batteries.

Today's cars use turbocharged hybrid engines and AI-assisted technologies

In addition to enhanced speed, serious accidents and technological advances have led to major innovations, leading to more aerodynamic and more protective cars.

NASCAR automobiles have become significantly more complex over time

The first generation of NASCAR automobiles were nearly identical to on-the-street models, with no modifications allowed to the body or frame. They even raced with doors. Fast-forward 75 years and the cars are 670-horsepower machines designed for racing.

The history of the North American power grid, which is composed of five major grids

Thomas Edison's Pearl Street Station was the first US commercial power plant, burning coal to power lamps for some Manhattan residents. Over time, local power plants would be bought out by larger ones, forming interconnected systems spanning multiple states. Today, the Eastern Interconnection and Western Interconnection are the largest of these systems.

Tesla open-sourced all its patents to speed up industry adoption of electric vehicles

The company employed a disruptive strategy to transform the transportation market, but early struggles, including leadership shifts and near bankruptcy in 2008, threatened its efforts to bring electric vehicles to the mainstream.

George Westinghouse purchased Tesla's AC technology patents for $60,000

The seven patents in alternating current motors and power transmission formed the basis for a system of technologies including generators, transformers, and lighting. Nikola Tesla spent half the funds on a new laboratory to develop new inventions.

The Society of Automotive Engineers sorts self-driving technology into six levels

At level 0, a vehicle cannot intervene on its own, and the driver controls all navigation. At level 3, the car operates autonomously under limited conditions, but a human can still take control. A future level 5 vehicle drives itself and lacks a steering wheel or pedals.

Space-bound rockets contain four major systems—structure, propulsion, payload, and guidance—and operate in stages, with different sections burning through their fuel before breaking off, to reduce dead weight and improve efficiency.

BYD Auto is the largest EV maker in China, overtaking Tesla

As of 2023, the company has 40% of the electric vehicle market in China and produces more than 3 million EVs for customers worldwide. Its vertical integration, which includes building its own batteries and cargo ships, has allowed BYD to lower retail costs.

By designing a $35,000 car, Tesla sought to bring EVs into the mainstream

Despite production delays, factory struggles, and skepticism from established carmakers, Tesla reached its goal of making 5,000 Model 3s per week. This achievement marked a turning point, proving that electric vehicles could be scalable to meet increasing demand.

Tesla plans to eliminate the use of rare earth elements in future vehicles

At a 2023 Investor Day event, Elon Musk outlined steps to focus Tesla's efforts on climate action rather than new vehicle models. Musk estimates the transition to carbon-free, sustainable energy will cost $10T.

Tesla's production of a high-performance electric vehicle revived the EV industry

The Model 3 shifted public perception by showing that EVs could be fast and desirable, and built at scale. However, at one point, Tesla built an entirely manual production line in a tent outside its main factory to keep up with demand.

BYD overcame Tesla via state backing, cheaper cars, and vertical integration

The one-time battery company eclipsed Tesla in total sales in 2024. The Chinese-backed manufacturer targets low- to mid-tier cars and builds 75% of its components in-house. Its cars typically retail at half the cost of similar Tesla models.

While charges consistently move in the same direction in a direct current, the flow of charges changes multiple times per second in an alternating current.

Explore a map of every charging station in the US and Canada

An electric vehicle owner's main fear running out of power before getting to their final destination. Using this interactive, users may identify stations and their charger type to map fuel corridors for EV road trips.

Electrogenic animals generate their own electricity within an electric organ by changing the pattern of electrical charges in disc-shaped cells called electrocytes.

Some geothermal power plants make electricity using a secondary fluid

Direct dry-steam systems pull underground steam into a turbine-generator system, while flash and double-flash cycle systems spray extracted liquid water into a low-pressure tank, causing it to rapidly vaporize—"flash"—before moving to the turbine. Binary cycle systems use the extracted steam and water to flash a second fluid that easily boils, which then drives the turbine.