How Do Electric Cars Work?

Electric cars have become a permanent feature on the UK’s roads, but how many of us actually know what’s going on under the hood of an EV?

By the end of May 2026, fully electric cars accounted for almost a quarter of new car registrations in the UK, and there were more than three million plug-in cars on UK roads. And, as a cleaner, greener option that puts the planet first, it’s easy to see why. And we all have a reasonable idea of how combustion engine cars work, but how do electric cars work?

The idea is simple enough: instead of filling up with petrol or diesel, you plug the car in and charge a battery. But the technology behind that is a little more interesting than it first sounds.

How do electric car engines work?

The first thing to know is that electric cars don’t have a traditional engine in the same way petrol and diesel cars do. Instead of burning fuel to create power, an electric vehicle uses energy stored in a battery to run an electric motor.

That’s one of the big differences between an EV and a conventional car. A petrol or diesel engine has lots of moving parts working together, including pistons, valves, fuel injectors, belts, and an exhaust system. An electric motor is much simpler in comparison. That doesn’t mean EVs are basic, though. The systems are still super clever, just in a different way.

At a simple level, here’s what happens:

1. You plug the car into a charger, and electricity flows into the battery. 
2. That battery stores the energy until you’re ready to drive. 
3. When you press the accelerator, the car’s control system decides how much power to send from the battery to the motor. 
4. The motor then turns that electrical energy into movement, which drives the wheels.

There are a few key parts involved as part of this process, too:

• The battery stores the electricity. 
• The controller manages how much power is delivered, depending on how gently or firmly you accelerate. 
• The inverter converts direct current, or DC, from the battery into alternating current, or AC, which is what many electric motors use. 
• Finally, the motor and drivetrain transfer that power to the wheels.

One of the nice things about driving an EV is that the power delivery feels smooth and immediate. There’s no need to wait for gears to change in the way you might with a conventional car, and many electric cars feel surprisingly quick from a standing start.

What are the different types of electric car?

Not every car with a plug works in the same way. The right choice depends on your lifestyle, your mileage, your access to charging, and how ready you feel to move away from petrol or diesel.

Battery electric vehicles

Battery electric vehicles, often called BEVs or fully electric cars, run only on electricity. They don’t have a petrol or diesel engine, and they don’t produce exhaust emissions while you’re driving because there’s no exhaust pipe.

You charge them at home, at work, or using public charging points. For many drivers, especially those who can charge at home, a fully electric car is the simplest and cheapest type of EV to run day to day.

Plug-in hybrid electric vehicles

Plug-in hybrids, or PHEVs, combine a rechargeable battery with a petrol or diesel engine. You can plug them in and drive shorter journeys using electric power, but there’s also a fuel engine available for longer trips or when the battery runs low.

They can be a good stepping stone if you’re not quite ready to go fully electric, particularly if you regularly do a mix of short local journeys and longer motorway drives. The key is remembering to charge them. If you don’t, you’ll mostly be carrying around a heavier petrol or diesel car.

Hybrid electric cars

Hybrid electric vehicles, sometimes called self-charging hybrids, mainly use petrol or diesel but have a small electric battery and motor to help improve efficiency. The battery is charged through the engine and regenerative braking, rather than by plugging into a charger.

They’re essentially taking stop-start technology to the next level, but not as far as a full EV. They can drive short distances on electric power in certain conditions, but they’re not the same as a plug-in car, and you won’t get the same electric-only range.

How far can electric cars drive?

Range is usually one of the first questions people ask about electric cars. It’s understandable, too. Nobody wants to be nervously watching the battery percentage drop on the motorway.

The good news is that EV range has improved a lot. Many new electric cars now offer well over 200 miles on a full charge, and some long-range models can go much further. The average range of new electric cars on sale in the UK is now close to 300 miles, although real-world range can vary.

A few things affect how far an EV can travel. 

• Battery size is the obvious one: generally, the bigger the battery capacity, measured in kilowatt hours, or kWh, the more energy the car can store. 
• But driving style, speed, temperature, tyre condition, load, and whether you’re using heating or air conditioning can all make a difference.
• Cold weather, in particular, can reduce range because the battery works less efficiently, and you’re more likely to use the heater. 
• Motorway driving also tends to use more energy than slower town driving.

That’s why the official range figure is useful as a guide, but it’s not a guarantee.

How does regenerative braking work?

One clever feature in electric and hybrid cars is regenerative braking. In a petrol or diesel car, braking turns a lot of moving energy into heat, which is then wasted. In an EV, the motor can work in reverse when you slow down, helping to put some energy back into the battery.

You’ll often notice this when you lift off the accelerator. The car may begin to slow more strongly than you’d expect, almost as if you’ve gently pressed the brake pedal. Some EVs even offer “one-pedal driving”, where you can speed up and slow down mainly using the accelerator.

It won’t fully recharge the battery on its own, but it does help improve efficiency, especially around town.

Electric car charging

Charging an electric car is usually much simpler than people expect. You plug it in, leave it to charge, and come back to a fuller battery. The main difference is that charging takes longer than filling a tank with fuel, so it works best when it fits naturally into your routine.

Charging your electric car at home

For many EV drivers, home charging is the easiest option. A dedicated home charge point – especially a point wired for fast-charging – will usually be much faster, safer, and more convenient than using a standard three-pin plug. Most UK home chargers are around 7kW, which is enough to add a useful amount of range overnight.

Smart home chargers can also help you schedule charging for cheaper off-peak electricity times, monitor your usage, and reduce the chances of charging when energy prices are higher.

Charging your electric car on the go

Public charging has grown quickly across the UK. You’ll find chargers at motorway services, supermarkets, retail parks, hotels, town centres, car parks, and dedicated charging hubs.

There are different charging speeds, and the names can vary, but they generally fall into standard, fast, rapid, and ultra-rapid categories. Standard and fast chargers are useful when you’re parked for a while, such as during shopping or at work. Rapid and ultra-rapid chargers are designed for quicker top-ups on longer journeys.

The connector you’ll use most often in the UK is Type 2 for slower AC charging, while rapid and ultra-rapid chargers usually use CCS for modern fully electric cars. Most public rapid chargers have the cable attached, so you don’t need to bring your own for those. For many slower public chargers, however, you may need your own cable.

Do electric cars still need maintenance?

Yes, they do. EVs don’t need oil changes, and they have fewer moving parts than petrol or diesel cars, but they’re not maintenance-free.

Tyres, brakes, suspension, steering, lights, wipers, air conditioning, wheel alignment, and cabin filters still need checking. EV tyres can also work hard because electric cars are often heavier and deliver instant torque. That makes regular tyre checks especially important.

Brakes may last longer thanks to regenerative braking, but they still need inspecting, particularly if the car does lots of short journeys where the friction brakes are used less often.

So, while an EV might have fewer engine-related jobs, it still needs proper care to stay safe, efficient, and roadworthy.

Thinking about switching to electric?

Electric cars have come a long way in a short time. Range is better, public charging is improving, and there are now far more models to choose from, from small city cars to family SUVs and company cars.

They won’t suit every driver in the same way, and it’s worth thinking about where you’ll charge, how far you usually drive, and what kind of journeys you do most often. But for many people, the switch is becoming easier than ever.

If you’ve got questions about electric cars, tyres, servicing, or general maintenance, your local Kwik Fit centre can help point you in the right direction. Contact us today or explore our blog for more advice.