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Currents: Thinking Deeper

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What is static electricity? Static electricity is the build up of charges on an object, but they do not flow. – PowerPoint PPT presentation

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Title: Currents: Thinking Deeper


1
What is static electricity?
Static electricity is the build up of charges on
an object, but they do not flow.
2
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3
  • Static Charge
  • What is a charged object?
  • A neutral object can become charged by gaining or
    losing electrons. If an object loses electrons,
    it is left with more protons (positive charge)
    than electrons (negative charge).

4
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5
Can you transfer charges? Charges must be
transferred from one object to another through
friction, conduction, or induction.

6
Friction
  • This is the transfer of electrons from one
    object to another by rubbing.

7
Conduction
  • This is the transfer of electrons from a charged
    object to another object by direct contact.

8
Induction
  • This is the movement of electrons to one part of
    an object caused by the electric field of another
    object.

9
What gains/loses electrons?
  • If an object gives up electrons, another object
    gains those electrons. Electrons are only
    transferred from one location to another.

Rubber (-)
Silk (-)
Wool ()
Fur ()
Amber (-)
Glass ()
Charges are not created nor destroyed.
10
Static Discharge
When a negatively charged object and a positively
charged object are brought together, electrons
move until both objects have the same charge.
11
Lightning
Lightning is an example of static
discharge. During thunderstorms, air swirls
violently. Water droplets within the clouds
become electrically charged.
12
Van de Graff Generator
  • A Van de Graff generator produces static
    electricity. Electrons are carried up a rubber
    belt and are transferred to the metal sphere.

13
Van de Graff Generator
14
Series Circuit
In a series circuit, there is only one path for
the current to take.
15
Parallel Circuit
In a parallel circuit, there are several paths
for current to take.
16
Advantages/Disadvantages
  • Series Circuit
  • Advantage
  • Easy to design and build
  • Disadvantage
  • When one device fails they all fail
  • Energy must be shared by all devices

Parallel Circuit Advantage When one device fails
the others remain on Disadvantage Hard to design
and build
17
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18
We Use Electricity Everyday!
19
Electrical Safety
Click on the two links below to play two
different internet Electrical Safety games.
  • Electrical Safety in the home (Internet Activity)

20
Historical Notes
  • Alessandro Volta was an Italian physicist who
    invented the battery in 1800 hence Volt
  • Georg Simon Ohm was a German physicist who did
    the experiments that resulted in Ohms Law in
    1827
  • Andre Marie Ampere was a French mathematician and
    physicist who made many contributions to our
    understanding of electricity in the 1820s

21
How electricity arrives in your home.
22
Resources
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    graphanimate.gif
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    ted.JPG
  • http//www.gregspeed.com/family/200403/static_ging
    er.jpg
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  • http//www.phys.virginia.edu/Education/Bitmaps/Hai
    r1.jpg
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    PTubing.jpg
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    pg
  • http//www.aerocomusa.com/tubing.jpg
  • http//www.dinosaursrock.com/amber2.jpg
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    uts_lrg.jpg
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    _2006_18_33_18/goldbar.jpg12b5d1e-a626-4806-adca-2
    cdfbd2e56e4Large.jpg
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    /whittaker/char12.gif
  • http//www.cartage.org.lb/en/themes/Sciences/Physi
    cs/Electromagnetism/Electrostatics/lectroSpectrum/
    Electrostatics/ElectrostaticInduction/escopec.gif
  • http//www.juniorcitizen.org.uk/kids/electricalsaf
    ety/electricity.gif
  • http//www.vikingmagic.com/ama/med/silks_asst._dif
    atta.jpg
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    icity/electricity/charges2020fields/electric_ch
    arge.htm
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    /Wool.www.usda.gov.jpg
  • http//www.dkimages.com/discover/previews/996/5051
    0887.JPG
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