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Think of yourself driving through the city, quietly passing by all the hustle and bustle. There’s no rumble of an engine, and no pollution trailing behind you. Instead, you’re driving an electric car – smooth, silent, and eco-friendly. But, beyond the obvious lack of exhaust fumes, what exactly is going on underneath the bonnet of these vehicles?
In this article we’ll answer just that, breaking down the essential components of an electric vehicle – from the battery that powers it to the electric motor that drives it forward. We’ll also explore how they charge, what sets them apart from hybrids, and why they’re more efficient than traditional internal combustion engine (ICE) cars.
Within every electric car is its beating heart – a battery, which replaces the petrol or diesel tank found in traditional vehicles. These batteries, which are well-known for their high energy density and long lifespans, store electrical energy that is later converted into motion by electric motors which drive the wheels. While lithium-ion batteries are the most common, several chemistries, such as nickel manganese cobalt (NMC) and lithium iron phosphate (LFP), are also frequently used in EVs.
EV battery technology is an incredibly fast-paced sector, and over the years manufacturers have refined battery technology to ensure that they’re powerful, but also safe and reliable. Modern EVs come with battery capacities ranging from 30 kWh to over 100 kWh, with larger batteries offering much greater range – over 400 miles in some models.
Once the battery has stored the necessary energy, the next step is converting it into motion – which is where the electric motor comes into play. Unlike ICE vehicles, which rely on the controlled explosion of fuel, an electric motor uses electromagnetic forces to generate movement. Electric motors are remarkably simple, typically containing just one moving component: the rotor.
Most EVs use either permanent magnet motors or AC induction motors, although some models do use variations – like brushless DC motors.
High-spec EVs often feature dual-motor setups (one for each axle), giving them all-wheel drive capability and enhancing their performance.
One standout feature of EV motors is their instantaneous torque, which is why they feel surprisingly quick off the line. Plus, fewer moving parts in the electric motor means fewer maintenance issues over the life of the vehicle. Learn more about these advantages of EV ownership in our article on EV upkeep vs petrol.
When you press the accelerator, the car’s computer tells the power electronics system (which manages the energy flow throughout the vehicle) to pull energy from the battery. That energy flows straight to the motor, which spins to drive the wheels. This all happens in an instant, giving EVs that instant acceleration feeling.
One of the most innovative features of electric cars is their regenerative braking system. In petrol or diesel cars, regular brakes use friction to slow you down, turning energy into heat. But with regenerative braking, some of that energy is saved and sent back into the battery.
How does it work? When you apply the brakes, the electric motor reverses its function and begins acting as a generator. It takes the kinetic energy (energy from an object in motion) from the car and turns it back into electrical energy, which is then stored in the battery for later use.
Regenerative braking extends the range of the car between charges and reduces wear on the mechanical brakes, effectively turning what was a wasteful process in a petrol car into an energy-saving EV feature.
Instead of visiting a petrol station, EVs recharge via a connector located where the fuel filler cap usually is. There are several basic methods of charging an EV:
To learn more about charging an EV, take a look at our comprehensive guide to EV parking.
While both EVs and hybrids use an electric motor, hybrids still rely on an internal combustion engine as the primary power source. Hybrids can switch between fuel and electric power based on driving conditions, which makes them more complex. While they are generally less efficient than fully electric vehicles, they’re typically more efficient than petrol-powered cars – although it does depend on the model of hybrid and the owners driving habits.
So, what makes electric cars more efficient than traditional vehicles? Well, we’ve briefly touched upon it earlier, but the answer lies in their ability to convert energy.
ICE vehicles lose most of their energy as heat, whereas EVs convert a much higher percentage of energy from the battery into motion – making them far more efficient. Research shows that EVs convert approximately 60-70% of electrical energy to power at the wheels, compared to only around 20-30% efficiency in petrol cars.
On top of that, EVs aren’t just efficient at converting energy. Features like regenerative braking, which significantly reduces brake pad wear, fewer moving parts, and no need for oil changes, means that EVs, in the long term, cost a lot less to maintain and require fewer repairs than traditional vehicles.
“Having tested every electric car that’s ever been on sale in the UK, as well as the vast majority of petrol and diesel cars over the last 20 years or so, I now don’t look forward to driving petrol or diesel cars. Electric cars have instant responses; in comparison, when you need to accelerate out of a junction onto a busy road, there’s a delay with petrol and diesel cars – even performance models. And then you have the silence and refinement of an electric car compared to the noise, harshness and vibration of a petrol or diesel car. And all that is before we start talking about the tailpipe emissions of petrol and diesel cars that have so much impact on local air quality and climate change.” – Paul Clarke
Now that you’re familiar with how electric cars run, it’s easier than ever to get excited about making the switch. If you’re looking for more expert advice or insights on all things EV, Green Car Guide has you covered. Browse the latest EV news, explore our comprehensive buyer’s guides, or check out our helpful FAQs to stay ahead of the curve.
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