Download Conductors and Insulators

Conductors and Insulators
Define a conductor and insulator
Conductivity
-Why does currents flow through wires? Why does the plastic
around the wire protect you?
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Conductivity- is the ability of an object to conduct (or
allow the flow of) electric current
Materials that allow this to happen are called conductors
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most metals, silver, copper are great conductors
Insulators are materials that do not allow currents to
flow. Thus protecting you
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example: plastic, glass, rubber, and wood
Resistors
● Some materials are not good conductors or
insulators
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meaning they do not completely block the flow of
current nor does it allow it to flow freely
● Resistors- allow electrical energy to be
transformed into other forms of energy
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example- the filament wire in a lightbulb is a
resistor
● As the filament resists the flow of current,
electrical energy is transformed into light and
heat and the filament begins to glow and give off
light
Electromagnetism
● In 1820s, the Danish physicist and professor Hans
Christian Oersted discovered that electricity and
magnetism are related
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this relationship is known as Electromagnetism
● When a compass is placed near a wire carrying an
electric current the compass needles is deflected
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this means that the electric current produces a
magnetic field
When this wire is twisted into loops, the magnetism
gets stronger. this is called a solenoid
Examples of Electromagnetism
● Electromagnetic cranes are used at dumps and
construction sites to lift large metal objects
● Electric motors, devices that transform electrical
into mechanical energy, operate on principles
electromagnetism
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doorbells
telephones
recording devices
washing machines
Safety Rules
● Our bodies are excellent conductors which is
why we need to take precautions
● Don’t put fingers in electrical sockets
● Don’t use electrical devices near water
● Not using devices that have been torn or frayed
● only putting plugs in outlets
● not overloading the socket with too many
devices
Videos
conductors/insulators https://www.youtube.com/watch?
v=eTlO1LNFtmQ
Bill Nye Season 1 Episode 18
https://www.hoopladigital.com/title/10023347