SNC1P – Electricity
Brisson
Charges at Work
Lightning
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_______________ = an _______________ between areas of
______________________________. Caused by _______________.
How Does Lightning form?
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Step 1
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Air currents in the storm cloud cause ______________________________.
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The _______________ of the cloud becomes ______________________________,
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and the _______________ becomes ______________________________.
Step 2
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Negative charges on the bottom of the cloud _______________ _______________
_______________ below the cloud
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by _______________ _______________ in the ground.
Step 4
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When the electrons get close to the ground, they _______________ _______________
that surge upward,
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_______________ _______________ between the cloud and the ground.
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This is the _______________ you see as a lightening flash.
Lightning between clouds
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This lightning never strikes the earth
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Can occur much _______________ _______________ than cloud-to-ground lightning
SNC1P – Electricity
Brisson
Photocopier
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The photocopying machine provides an example of a substance that is able to be both an
_______________ and a _______________ depending on the amount of light shining on it.
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Selenium is _______________ _______________ – it acts as
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an _______________ in the _______________,
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and as a _______________ in the _______________.
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A photocopier uses the scientific principle that electric _______________ _______________ from a
surface by using light.
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Step 1:
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a selenium coated, flat metal plate is _______________ charged.
Step 2:
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light shone through a _______________, projects an image of the page to
be copied onto ______________________________.
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_______________ ________areas (the printed areas on the page),
_______________ _______________ charged.
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Step 3:
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Particles of _______________ _______________ are _____________
over the plate,
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and are _______________ _______________ ____________on the plate.
Step 4:
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A _______________ _______________ piece of _______________ is brought in contact with the
plate
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and the _______________ _______________ particles
_______________ to the paper.
Step 5:
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A lamp ______________________________
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causing the ink to ______________________________,
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making a _______________ __________of the original