1.2 & 1.3 Charging by Contact & Induction and Lightning.

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Presentation transcript:

1.2 & 1.3 Charging by Contact & Induction and Lightning

Pith ball electroscope Metal leaf electroscope TVO VIDEO SERIES: pJGe0oLY5-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

 By Induction: ◦ Movement of electrons in a substance without direct contact with an object  The force is attractive

AttractionRepulsion  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

 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

 The large negative charge pushes away negative charges in the earth = Positive charge  Giant discharge = Lightning  heats air to degrees Celsius (hotter than sun)  Air molecules collide and produce thunder

 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