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Charging on!1.2 & 1.3
Charging by Contact & Induction and Lightning
Pith ball electroscope Metal leaf electroscope
TVO VIDEO SERIES: http://www.youtube.com/watch?v=OL9wcTBjDN0&list=PLdIVKwXe8Up9z0pJGe0oLY5-yLbsaz_b7
Electroscope: detects the presence of electric charges
By Contact: ◦ Generating a charge on a neutral object by touching
it with a charged object Neutral object will have the same charge as the object
charging it
Charging...
Charging By Induction:
◦ Movement of electrons in a substance without direct contact with an object The force is attractive
Electric Fields
Attraction Repulsion
The space around a charged object The effect of its charge can be felt by other objects The greater the charge, the stronger (and bigger) the
field Electric forces are transmitted at the speed of light
Lightning!
Lightning!
Strong winds and collisions between water droplets and clouds cause electrons to be transferred and a charge to occur
Lower parts of clouds are negatively charged
Upper parts are positively charged
Lightning!
The large negative charge pushes away negative charges in the earth = Positive charge
Giant discharge = Lightning
heats air to 33000 degrees Celsius (hotter than sun)
Air molecules collide and produce thunder
Lightning!
A rod attached to a house that is connected to a buried cable or rod
If lightning strikes it will drain off into the ground without creating a fire in the house
Invented by Ben Franklin
Lightning Rods