Engine power
Imagine having to walk on road everywhere, instead of riding in a car.
Engines are machines that use fuel to do work for us and make life easier.
Fuel is a substance that has chemical energy stored inside it.
The energy is released as heat by burning or exploding the fuel in a engine.
Engines are machines that use fuel to do work for us and make life easier.
Fuel is a substance that has chemical energy stored inside it.
The energy is released as heat by burning or exploding the fuel in a engine.
Most cars have petrol engines.
A mixture of air and petrol is pushed into a hollow chamber called the cylinder.
A spark from a spark plug makes it explode, which pushes a piston down inside the cylinder (see below).
This movement is used by gears to turn the wheels.
Most cars have four or six cylinders.
A mixture of air and petrol is pushed into a hollow chamber called the cylinder.
A spark from a spark plug makes it explode, which pushes a piston down inside the cylinder (see below).
This movement is used by gears to turn the wheels.
Most cars have four or six cylinders.
(This shows the foil—stroke cycle of a petrol engine.)
(I Air and petrol mixture is sucked into the cylinder)
(The piston moves up and squeezes the mixture)
(A spark from the plug makes the mixture explode)
(The piston rises to push waste gases out of the cylinder)
(I Air and petrol mixture is sucked into the cylinder)
(The piston moves up and squeezes the mixture)
(A spark from the plug makes the mixture explode)
(The piston rises to push waste gases out of the cylinder)
A diesel engine works in a similar way, but without sparks.
The mixture of air and diesel is squashed so much in die cylinder that it becomes hot enough to explode.
Diesel engines are used where lots of power is needed, in trucks, diggers, tractors and big trains.
The mixture of air and diesel is squashed so much in die cylinder that it becomes hot enough to explode.
Diesel engines are used where lots of power is needed, in trucks, diggers, tractors and big trains.
(Jet engines are very powerful. They use a mixture of dir and fuel to push the plane forward at high speed.)
A jet engine mixes air and kerosene and set fire to it in one long, continuous, roaring explosion.
Incredbly hot gases blast out of the back of the engine. This push the engine forward — along with the plane.
Incredbly hot gases blast out of the back of the engine. This push the engine forward — along with the plane.
An electric motor passes electricity through colls wire.
This makes the coils magnetic, and they push or pull against magnets around them.
The push-pull makes the coils spin on their shaft (axle).
This makes the coils magnetic, and they push or pull against magnets around them.
The push-pull makes the coils spin on their shaft (axle).
Engines which burn fuel give out gases and particles through their exhausts- Some of these gases are harmful to the environment.
The less we use engines, the better.
Electric motors are quiet, efficient ami relieble but they still need fuel to make the electricity at the power station.
The less we use engines, the better.
Electric motors are quiet, efficient ami relieble but they still need fuel to make the electricity at the power station.
QUIZ
What type of engine is found in these vehicles,Is it a Jet engine, an electric motor, a petrol engine or a diesel one?
1. Cable-car
2-. Formula I racing car
3. Fork-lift truck
4. Land-gpeed record car
2-. Formula I racing car
3. Fork-lift truck
4. Land-gpeed record car
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