The clutch disconnects the engine from the wheels so you can change gear. Press it down, move the lever, then lift it slowly. The point where the car starts to move is the bite point, and finding it smoothly is the first big skill of a manual lesson.
03 / How cars work
The machine,
made simple.
You don't need to be a mechanic to drive, but knowing what happens when you press a pedal makes you a calmer, safer and cheaper-to-run driver.
01
How a petrol engine makes power
Almost every petrol and diesel engine since 1876 uses the same four-stroke cycle. The crankshaft turns twice for every one power stroke.
STROKE 01
Intake
The piston moves down and the intake valve opens. A mix of air and fuel is sucked into the cylinder.
STROKE 02
Compression
Both valves close and the piston moves up, squeezing the mixture into a tiny space.
STROKE 03
Power
The spark plug fires. The mixture explodes and forces the piston down hard. This is the only stroke that makes power.
STROKE 04
Exhaust
The exhaust valve opens and the piston pushes the burned gases out to the exhaust pipe. Then it all repeats, thousands of times a minute.
A diesel works the same way but has no spark plugs. It squeezes air so hard that it gets hot enough to ignite the fuel on its own. An electric motor skips all of this: magnets and electricity spin the shaft directly, which is why EVs are silent and pull instantly.
02
Petrol, diesel, hybrid or electric?
The "fuel type" box on every car advert. Here is what each one means in real life.
Petrol
Diesel
Mild hybrid (MHEV)
Full hybrid (HEV)
Plug-in hybrid (PHEV)
Electric (BEV)
| Type | In one line | Good | Watch out | Best for |
|---|---|---|---|---|
| Petrol | Most common choice for new drivers | Smooth, quiet, cheap to buy, good for short trips. | Worse mpg than diesel on long runs. | Small cars, town driving, low insurance. |
| Diesel | Strong pulling power, great on motorways | Excellent fuel economy over long distances. | Dirtier exhaust; older diesels charged in clean-air zones. Diesel particulate filters clog on short trips. | High-mileage drivers, towing. |
| Mild hybrid (MHEV) | A petrol or diesel with a small electric helper | Slightly better economy, no plugging in. | Cannot drive on electric power alone. | Basically a normal car with a small boost. |
| Full hybrid (HEV) | Petrol engine + electric motor that charges itself | Very economical in town, very reliable (Toyota made these famous). | Usually automatic only. | Drivers who want low running costs without charging. |
| Plug-in hybrid (PHEV) | Bigger battery you charge from a socket | 20–60 miles of electric-only driving, petrol for long trips. | Heavy, and inefficient if you never plug it in. | Short commutes with home charging. |
| Electric (BEV) | Battery and motor only, no tailpipe | Silent, instant acceleration, very cheap to run if charged at home. | Higher purchase price, public charging can be costly, insurance can be higher. | Anyone with off-street or workplace charging. |
Fuel pump colours in the UK: green handle = unleaded petrol (E10 is standard, E5 "super" for older cars). Black handle = diesel. Diesel nozzles are wider, but a petrol nozzle can fit a diesel filler, so always double-check.
03
Getting power to the road
Which wheels are driven changes how a car feels, especially in the wet. Orange shows where the power goes.
Front-wheel drive
Engine at the front drives the front wheels. Compact, cheap and predictable in the wet. Most small cars work like this.
Rear-wheel drive
Front engine, rear wheels pushed via a propshaft. Better balance and handling. Common on BMWs, Mercedes and sports cars.
All-wheel / four-wheel drive
Power goes to all four wheels for grip in snow, mud or on fast roads. Badges include quattro, xDrive, 4MATIC and 4Motion.
Electric (rear motor)
A motor sits right on the axle. Dual-motor EVs put one on each axle for all-wheel drive. There is no propshaft and no gearbox.
04
Manual vs automatic & interactive clutch simulator
Most UK learners still take their test in a manual, but automatic tests are growing fast. Drag the clutch pedal slider below to see how the friction plate meets the flywheel at the bite point, and click gears 1–6 to see how synchromesh ratios trade torque for road speed.
PEDALS · C-B-A
SIX-SPEED MANUAL · H-PATTERN
1st and 2nd are for pulling away and slow corners. 3rd and 4th are for town roads. 5th and 6th are for cruising at 50+ mph. An automatic has P (park), R (reverse), N (neutral) and D (drive) and changes gear by itself.
Manual licence
Pass in a manual and you can drive manual and automatic cars.
Automatic licence
Pass in an automatic or EV and you can only drive automatics. To upgrade, you take another practical test in a manual.
Which to choose?
Automatic is quicker to learn. Manual gives you more choice of cheap used cars, which are still mostly manual.
05
Brakes, steering and suspension
The three systems that keep you in control. Each one is in the 3D explorer too.
BRAKES
Stopping
Your foot pushes fluid through pipes to calipers that clamp the discs. ABS stops the wheels locking so you can still steer in an emergency stop. The handbrake (often an electric button now) holds the car when parked.
STEERING
Turning
The steering wheel turns a rack that pushes the front wheels left or right. Power steering makes it light. Many modern cars add lane-keeping that nudges the wheel for you.
SUSPENSION
Comfort and grip
Springs soak up bumps and dampers stop the bouncing. Sports cars are set up firm for grip, luxury cars soft for comfort. Big wheels with thin tyres look good but ride harder.
06
How to read a tyre
Every tyre has its size printed on the sidewall. You will need this when buying new ones.
01205
Tyre width in millimetres.
0255
Sidewall height as a percentage of the width (55% of 205 mm).
03R
Radial construction. Almost every car tyre is radial.
0416
Fits a 16-inch wheel.
0591
Load index: each tyre can carry up to 615 kg.
06V
Speed rating: safe up to 149 mph (240 km/h).
07
Reading a spec sheet
Car adverts are full of numbers. Here is what a typical small hatchback's figures look like, and what each one means.
1.0LEngine size (1,000 cc). Bigger engines usually mean more power, more fuel and higher insurance.
100PSPower. 100 PS ≈ 99 bhp ≈ 74 kW. A small hatch has 70–130; a hot hatch 200–330.
170NmTorque is the twisting force you feel when pulling away or overtaking. Diesels and EVs have lots.
10.5s0–62 mph time. Under 6 s is properly quick. Most family cars take 8–12 s.
55mpgMiles per gallon. Higher is better. EVs quote miles per kWh (3–4.5 is typical).
115g/kmCO₂ emissions. This sets first-year car tax on new cars and affects company car tax.
bhp vs PS vs kW: they all measure power. 1 PS ≈ 0.986 bhp, and 1 kW ≈ 1.34 bhp. EVs list their battery in kWh (the size of the "fuel tank") and their motor in kW (how powerful it is).
08
Body types
The shape names you will see on every car website.
Hatchback
Small car with a rear door that lifts up. The classic first car: Fiesta, Corsa, Polo, Clio.
Saloon
Separate boot with its own lid. A "three-box" shape: BMW 3 Series, Mercedes C-Class.
Estate
Long roof and a big boot: Skoda Octavia Estate, Volvo V60.
SUV / crossover
Raised height and chunky looks. Crossovers like the Qashqai are hatchbacks on stilts.
Coupé
Sporty two-door shape with a sloping roof: Audi TT, BMW 4 Series.
Convertible / cabriolet
The roof folds away: Mazda MX-5, Mini Convertible.
MPV / people carrier
Tall and boxy with up to seven seats. Mostly replaced by 7-seat SUVs.
Pickup
Open load bed at the back: Ford Ranger, Toyota Hilux.
09
Checks you can do yourself
Five minutes a month saves money, keeps you safe, and is exactly what examiners ask about in "show me, tell me" questions.
01
Engine oil
Check with the dipstick on level ground with the engine cold. Top up between MIN and MAX with the oil grade in your handbook.
02
Coolant
Look at the see-through expansion tank with the engine cold. The level should sit between MIN and MAX.
03
Screenwash
Top up with screenwash fluid, not plain water, which freezes. Driving with an empty washer bottle can fail an MOT.
04
Tyre pressures
Check monthly and before long trips when the tyres are cold. Correct pressures are on a sticker in the door frame or fuel flap.
05
Tyre tread
The legal minimum is 1.6 mm. A 20p coin is a rough guide: if you can see the outer band, the tread may be too low.
06
Lights
Walk around the car with the lights and indicators on. Use a reflection in a window to check your brake lights.
07
Wipers
Smearing or juddering means the blades need replacing. They are cheap and easy to change.
08
Servicing
Follow the service schedule, usually every 12 months or 10,000 miles. A full service history adds value when you sell.
10
Buying your first car
For most new drivers the biggest cost is insurance, not the car. Choose a car in a low insurance group with a small engine.
Ways to pay
- CASH
- Cheapest overall. A used car you own outright.
- HP
- Hire Purchase: monthly payments, you own it at the end.
- PCP
- Personal Contract Purchase: lower payments, then a big "balloon" payment to keep it, or hand it back.
- LEASE
- Long-term rental. You never own it and there are mileage limits.
Before you buy a used car
- Check the free MOT history on gov.uk using the number plate
- Run a history check for outstanding finance, write-offs and theft
- Make sure the V5C logbook name and address match the seller
- Look for a service history with stamps or receipts
- Test drive it: brakes, gears, warning lights, strange noises
- Get an insurance quote before you commit
Popular, sensible first cars
Toyota Aygo X / Yaris
Very reliable, low insurance groups, hybrids available on the Yaris.
Hyundai i10 / Kia Picanto
Cheap to buy and insure, long warranties.
VW Polo / Skoda Fabia / SEAT Ibiza
Same parts underneath, grown-up feel, easy to drive.
Ford Fiesta (used)
Out of production since 2023 but loads around, great to drive, cheap parts.
Dacia Sandero
The cheapest new car in the UK for years. Simple and honest.
Fiat 500 / Mini
Fun and stylish, easy to park. Minis cost more to insure.
11
Filling up and charging
At a UK petrol station you fill up yourself, then pay at the pump or in the shop. Electric cars plug in instead, at home or on the road.
GREEN HANDLE
E10 unleaded
Standard petrol since 2021, up to 10% ethanol. Fine for almost all cars built after 2011.
GREEN HANDLE
E5 super unleaded
Higher octane, for performance and older cars. Costs more.
BLACK HANDLE
Diesel
Only for diesel cars. Putting petrol in a diesel (or the reverse) can wreck the engine: don't start it, call for help.
Charging an electric car
2.3 kW
3-pin plug
Emergency only. About 30+ hours to fill a typical battery.
7 kW
Home wallbox (Type 2)
Overnight at home. The cheapest way to charge on an off-peak tariff.
7–22 kW
Public fast (Type 2)
Supermarkets, car parks, streets. Good while you shop or work.
50–350 kW
Rapid (CCS)
Motorway services and hubs. Roughly 10–80% in 20 to 40 minutes.
Most UK electric cars use a Type 2 plug for slower charging and CCS for rapid charging. Older Nissan Leafs use a connector called CHAdeMO. Apps like Zapmap show every public charger.
12
What a car really costs a year
A rough example for a 19-year-old driving a 10-year-old 1.0-litre hatchback about 7,000 miles a year. Insurance is by far the biggest cost.
TOTAL, ROUGHLY
£3,840
About £320 a month, before buying the car itself.
- INSURANCE FALLS EACH YEAR YOU DRIVE WITHOUT A CLAIM (NO-CLAIMS BONUS)
- A BLACK-BOX POLICY CAN CUT IT A LOT IF YOU DRIVE CAREFULLY
- ELECTRIC CARS COST LESS TO FUEL AT HOME BUT OFTEN MORE TO INSURE
- DEPRECIATION (VALUE LOST) IS EXTRA, AND BIG ON NEWER CARS