lesson 6-7 Flashcards
What are the metals attracted to a magnet?
Iron and nickel
What does electricity produce?
magnetism
How many magnets does an electro motor need?
2
What is the Earth like?
Giant magnet
What is the difference between an electric motor and electric generator?
An electric motor produces electricity into movement and an electro generator transforms the movement to electric current.
Metal detectors and credit cards are examples of…
artificial magnets
How is a magnet field created?
From the flow of an electric current through an electric circuit
What does an electric motor consists of?
A coil of wire between two magnets
What are some machines with an electro motor?
open
What does a dynamo use?
magnet and a conductive coil of wire
What doesn’t move in a dynamo?
the coil
What is the invisible area around a magnet called?
magnetic field
How do you make an electric field stronger?
Turning the wire into spirals making a coil
What do magnets have?
Poles (north and south)
What is the core of the Earth composed of?
iron and nickel at high temperatures
What are other things the produce electromagnetic electricity?
generators
What other things use electric generator similar to dynamo?
power stations
Why do power stations need to use very large electric generators?
because they produce the electricity for all parts of the country
What does repel mean in a magnet?
That of the poles are the same they don’t attract each other
What does a magnestism produce?
electricity
What happens if a magnet is cut in half?
the poles don’t change
What is the needle of a compass attracted to?
Magnetic couth pole of the earth
how is the light in a bike produced?
by the movement
What did Michael Faraday discovered?
if you connect a coil of copper to a meter and put a magnet in the middle it creates a magnetic field and produces electricity
What do thermal plants use?
steam energy
In a magnet when do poles attract each other?
when they are opposite poles
What do many everyday appliances have?
electric motor
What does an electric motor need to work?
electromagnetism
What do hydroelectric plants use?
moving water
What is the most simple generator?
dynamo
What is a meter?
a device that measures electricity
What makes the light in a bicycle work?
the dynamo which has a magnet and a conductive coil of wire which create electricity
What is electromagnetism used for?
generators and electric motors
What is a coil?
a spiral made from wire
What are the types of power stations that use electric generators
wind turbines, hydroelectric and thermal power plants
How does a compass work?
the needle that points north in the compass attracts the magnetic south pole of Earth.
Electric generators are similar to…..
dynamos
What is a compass?
a device that helps you navigate and always points north
What happens when the electric current stops flowing?
the electromagnet loses its magnetism
What is the mineral of natural magnet called?
magnetite
