Title: Currents: Thinking Deeper
1What is static electricity?
Static electricity is the build up of charges on
an object, but they do not flow.
2(No Transcript)
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(No Transcript)
5Can 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.
7Conduction
- This is the transfer of electrons from a charged
object to another object by direct contact.
8Induction
- This is the movement of electrons to one part of
an object caused by the electric field of another
object.
9What 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.
10Static Discharge
When a negatively charged object and a positively
charged object are brought together, electrons
move until both objects have the same charge.
11Lightning
Lightning is an example of static
discharge. During thunderstorms, air swirls
violently. Water droplets within the clouds
become electrically charged.
12Van 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.
13Van de Graff Generator
14Series Circuit
In a series circuit, there is only one path for
the current to take.
15Parallel Circuit
In a parallel circuit, there are several paths
for current to take.
16Advantages/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(No Transcript)
18We Use Electricity Everyday!
19Electrical Safety
Click on the two links below to play two
different internet Electrical Safety games.
- Electrical Safety in the home (Internet Activity)
20Historical 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
21How electricity arrives in your home.
22Resources
- http//www.miamisci.org/af/sln/frankenstein/vander
graphanimate.gif - http//cache.eb.com/eb/image?id93633rendTypeId4
- http//www.sitemason.com/files/dqYN6E/generatoredi
ted.JPG - http//www.gregspeed.com/family/200403/static_ging
er.jpg - http//education.jlab.org/glossary/vandegraaff.jpg
- http//www.phys.virginia.edu/Education/Bitmaps/Hai
r1.jpg - http//www.northernbrewer.com/pics/fullsize/Thermo
PTubing.jpg - http//www.1st-line.net/mas_assets/thumb/232P-66.j
pg - http//www.aerocomusa.com/tubing.jpg
- http//www.dinosaursrock.com/amber2.jpg
- http//www.tindaraorchids.com/images/supplies/pean
uts_lrg.jpg - http//files.turbosquid.com/Preview/Content_on_4_2
_2006_18_33_18/goldbar.jpg12b5d1e-a626-4806-adca-2
cdfbd2e56e4Large.jpg - http//www.dearbornschools.org/schools/dcmst/staff
/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 - http//ncert.nic.in/sites/learning20basket/electr
icity/electricity/charges2020fields/electric_ch
arge.htm - http//upload.wikimedia.org/wikipedia/commons/a/a4
/Wool.www.usda.gov.jpg - http//www.dkimages.com/discover/previews/996/5051
0887.JPG