🔧 Engines and power

Most car engines burn a tiny spray of fuel mixed with air inside sealed metal cylinders, and each small explosion pushes a piston down hard, similar to a tiny controlled bang happening over and over very quickly. That pushing motion turns a rotating shaft called the crankshaft, which eventually spins the wheels through a chain of connected parts. A typical engine can fire these tiny explosions hundreds of times every single minute, which is why engines sound like a fast, steady rumble rather than separate individual bangs.

Inside an electric motor, electricity flows through a coil of wire surrounded by magnets, and that flowing electricity creates its own magnetic force that pushes against the surrounding magnets. Because magnets naturally push and pull each other, that push causes the coil to spin continuously, and that spinning directly turns the wheels without needing any burning or explosions at all. Electric motors can also often work in reverse, turning the spinning motion of wheels back into electricity, which is exactly how many electric cars recapture energy while braking.

A hybrid car has both a traditional petrol engine and an electric motor working together, switching between them or combining their power depending on what the car needs at that moment. At low speeds or when starting from a stop, the quieter, efficient electric motor often does most of the work, while the petrol engine kicks in for extra power during faster driving or overtaking. This teamwork lets a hybrid car use noticeably less fuel overall than a car with only a petrol engine, since the electric motor handles many of the situations where petrol engines waste the most energy.

When you press the brake pedal, that force travels through brake fluid in sealed tubes, pushing hard pads against a spinning metal disc attached to each wheel. The rubbing between the pads and the spinning disc creates friction, which slows the wheel down by converting the car's moving energy into heat, the same way rubbing your hands together warms them up. Because brakes work by creating heat, they can actually get extremely hot during long, hard braking, which is why brake parts are specially designed to handle high temperatures safely.