An electric vehicle (EV) is a car driven by one or more electric motors instead of a petrol or diesel engine. When people say "EV" today they usually mean a battery-electric vehicle (BEV) — a car that stores energy in a large rechargeable battery and has no combustion engine at all. This guide explains how an EV works, what its numbers mean, and where it genuinely beats — or loses to — a conventional car.
How an electric vehicle works
Every BEV shares four core parts. A high-voltage battery pack stores energy, measured in kilowatt-hours (kWh). One or more electric motors turn that energy into motion. A power inverter converts the battery's direct current into the alternating current the motor needs and controls how much torque is delivered. Finally, an on-board charger and charge port let you refill the battery from the grid.
Because an electric motor makes its full twisting force (torque) almost instantly, even affordable EVs feel quick from a standstill. There is no gearbox shuffling through ratios — most EVs use a single-speed reduction gear, so acceleration is smooth and silent. When you lift off the accelerator, the motor runs in reverse as a generator and recovers energy through regenerative braking, sending it back into the battery and reducing wear on the brake pads.
The numbers that matter
- Battery capacity (kWh) — roughly the "fuel tank" size. Bigger usually means more range and more cost.
- Range — how far the car travels on a full charge. Watch which test cycle is quoted; Chinese cars often advertise the optimistic CLTC figure.
- Power (kW or hp) — how strong the motor is. 1 kW is about 1.34 hp.
- Charging speed (kW) — how fast the battery refills. A 7 kW home charger is slow and overnight; a 250 kW public DC charger can add hundreds of kilometres in 15–20 minutes.
- Efficiency (kWh/100 km) — the EV equivalent of fuel economy. Lower is better.
The advantages
EVs are cheaper to run: electricity costs far less per kilometre than petrol, and there is no oil, no clutch, no exhaust and far fewer moving parts to service. They are quiet, smooth and produce zero tailpipe emissions, which is why most of the Chinese models we cover — from budget crossovers to 800-volt flagships — are pure electric. Instant torque also makes them genuinely fun to drive in town.
The trade-offs
The honest downsides are upfront price, charging time versus a two-minute fuel stop, and the need to plan longer trips around chargers. Cold weather and motorway speeds reduce range. Battery replacement is expensive out of warranty, though modern packs are engineered to last the life of the car and lose only a small percentage of capacity over many years.
EV vs hybrid: which is which?
A BEV plugs in and only ever runs on electricity. If you are not ready to go fully electric, a hybrid car pairs a battery with a petrol engine, and a plug-in hybrid (PHEV) lets you drive short trips on electricity while keeping the engine for long journeys. If you want the deeper detail behind range claims or battery sizing, see our guides on how EV range is measured and what battery kWh really means.
The bottom line
An electric vehicle is, mechanically, the simplest car you can buy: a battery, a motor and software. For drivers who can charge at home or work and rarely do long unbroken motorway runs, an EV is cheaper, calmer and quicker than the petrol car it replaces. The rest of this Learn section unpacks each piece — batteries, charging, motors and range — so the spec sheet on any review stops being a wall of jargon.
