Physics Exam - 8 grade - 3 trimester - 2 midterm Flashcards
Circuit:
Is a route through which electrical current can flow.
How do electrons flow?
They flow from the negative points of the battery to the positive.
Magnetism:
is the set of phenomena related with magnets and magnetic materials.
Depending on the origin magnets can be:
Naturally occurring and manmade.
Examples of naturally ocurring magnets are:
Iron, nickel, cobalt, titanium oxide.
Examples of manmade magnets are:
Materials that when they interact with strong magnets or electromagnetic current become magnets.
What is a magnetic field?
Is the disturbance generated by a magnet in a region in space
Electromagnetism:
Is the field of study that merges electric phenomena and magnetic
phenomena in a single theory.
Examples of Electromagnetic machines are:
Solenoids, Electromagnets, Electric Motors, Dynamos.
Solenoid:
Is a coil of current-carrying wire.
Electromagnet:
Is a solenoid with a coil made of magnetic material such as iron. The magnetic field becomes stronger.
An electric motor transforms electrical energy into:
Mechanical energy. It has external magnets.
Dynamo:
Is a machine that transforms mechanical energy into electrical energy.
Electric power plant:
Is an industrial facility which produces electrical energy.
Nucelar Plants:
Nuclear reactions are used to heat water and produce steam. Energy yield from this plants is high. It is non-renewable. Produces wastes.
Fossil Fuel Power Plant:
It is a plant that burns fossil fuels such as gas and coal to heat water.
Energy yield from this plants is low. It is nonrenewable. Pollutes the environment.
Geothermal Power Plant:
Water is heated using the Earth’s inner heat. Energy yield of these
plants is low. It is renewable and No wastes are produced.
Hydroelectric Plant:
In rivers or dams masses of water falling through step vertical distances move the generators. Energy yield is high, doesn´t pollute, and no wastes are produced.
Tidal Power Plant:
Uses the energy of waves or tides. Energy is high, renewable and doesn´t pollute.
Wind Energy Plant:
Energy of wind is used to drive the turbines in electrical generators. Energy yield is low, renewable and doesn´t pollute.
Solar Power Plant:
Solar radiation is used to heat water. Energy yield is low. It is renewable and doesn´t pollute.
Renewable Energy:
It is energy that comes from natural sources that never run out and can be used over and over for example: sunlight, wind, tides, stored water, Earth’s heat, and biomass.
Non-renewable Energy:
It is energy that comes from sources that will run out for example: fossil
fuels, coal, petroleum, and natural gas.
The Solar System consist of:
The sun, planets, moons, asteroids, meteors, dust, gases, and primarily empty space.
The Sun is made of:
Hydrogen and helium. It is a star that doesn´t have a solid surface, but is a ball of gas held together by its own gravity.
Solar Flares from the sun are:
Sudden burst of radiation coming from the release of magnetic
energy associated with sunspots.
The 8 planets in our solar system:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
The inner planets are also called:
Terrestrial Planets because they are dense and rocky.
