Electricity And Magnetism Exam
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What happens when you break a magnet in half
You get two new magnets
What materials can be used to make a magnet
Ferromagnetic materials such as cobalt iron chromium and nickel
Draw a magnetic field around a magnet
On paper
How do magnetic poles interact
Like poles repel unlike poles attract
Where is the magnetic field the strongest
It is strongest at either pole
What is the difference between a temporary magnet and a permanent magnet
A temporary magnet is created by using an electric field and can be switched on and off so the material is no longer magnetic. A permanent magnet is made of a material in which all of the particles are facing the same way.
Draw the domains of a paper clip that is not a magnetic
On paper
Draw the domains of a paper clip that is a magnet
On paper
How can you make an electromagnet. Draw a picture.
You wrap a wire around a nail and connect the ends to a positive ends of a battery. On paper.
What causes magnetism
The constant flow of electrons
how can you make an electromagnet stronger?
• coil wires tighter together • add larger metal core • add more batteries • increase the current in the solenoid • add more loops of wire to the solenoid • use a stronger magnetic material for the core
which would convert electrical energy faster a 100 watt light bulb or a 4,000 watt space heater
a 100 watt light bulb
a generator converts bland energy to blank energy
mechanical to electrical
a motor converts blank energy to blank energy
electrical to mechanical
how are motor and generator related
they both generate one type of energy into a different type of energy
what are renewable resources. give examples.
resources that can be put back into the environment on a human time scale ex: hydroelectric power, wind power
what are non renewable resources. example
resources that cant be put back into the earth on a human time scale ex: coal, nuclear
what are the pros and cons of the current that Nicola tesla created. what is that current called?
Alternating Current Pro: more efficient for transmitting power through cable Con: cant be used in electric devices
what are the pros and cons of the current that Thomas Edison created. what is that current called?
direct current pro: control of power flow is much easier con: cant be transmitted over long distances
what is happening in step one? the coal is releasing its chemical energy into what type of energy?
in step one the coal is being burned in the boiler, releasing its chemical energy into nuclear energy
what is flowing through the pipes in step two
in step two steam is flowing through the pipes
what is the device in step three called? what type of energy does it use?
it is a turbine and it uses wind energy
what is the device called in step four? what two things are inside the device?
the device is a generator. the two things inside it are brushes and armature.
what is the device in step five called? Why is this changing voltage important?
the device in step five is a step down transformer. this changing voltage is important because if too much power is transmitted, it could cause a black out.