Appliances
What do appliances do?
They do all kind of houshold chores.
What energy transforms the electrical machines?
The electrical machines transform electrical energy into mechanical energy.
How is radiation transmitted?
By waves
How does the motor of the electric screwdriver work?
It is an electric motor, which turns to the left and to the right at different speeds / shifts /velocities.
What does a light lamp transforms?
It transforms electrical energy into light energy.
What are the electromagnetic devices?
Thay are the ones which take advantage of the properties of electromagnets.
Name 2 types of electrical machines.
The generators and the motors.
How is the heat of the vitroceramic dishes transmitted?
By contact from the resistance to the surface of the glass.
How does the motor of a vacuum cleaner work?
It makes the blades of a turbine which absorve air from the outside rotate.
Give some examples of electrostatic machines?
The photocopier, laser printers...
Name some devices which need electricity to work.
Lighting, robotics, transport, appliances...
Where do we use the motors?
In the trains, cars, airplanes, ships, trucks.
Name 3 ways to transmitt the heat produced by a resistance.
By conduction, convection and radiation.
What are the parts of the fridge?
Thermostat, freezer, registrator, evaporator.
How is the light bulb illuminated?
The filament has a high resistance and it is heated to high temperatures when the electrical current passes through it.
What is the basic energy photocopiers uses to work?
They use static electricity.
What can you use to transform movement into electricity?
You can use a generator.
Name basic examples of household appliances which use radiation.
Plates and electrical stoves of infrared rays.
What do the electric drill and the electric screwdriver have in common?
They can either work connected to the net or with batteries.
What is used the bulb glass for?
It protects the filaments from the contact with the oxygen in the air, which would burn it otherwise.
Does the photocopier use the negative charges in light points?
No; it uses negative charges.
Why are the electric machines important?
Because they do a lot of work for us.
How does hot air work in order to heat a room up?
The hot air goes up leaving an empty space which will be filled in with colder air and, so, generating an air circulation which will warm the room by convection.
Which is the name of the new gas used in the fridges?
HFC
Explain the parts of a bulb.
The bulbs are made up of a glass bottle with a fastening cap. The bottle has an inert gas and a filament connected to the cap.