Lesson 12 Some Natural Phenomena
Objectives: To
1) define lightning and its causes
(2) define an Electric charge
(3) test for the charges on an object
(4) define an earthquake and its causes
Charges
Positive charge Negative charge
(proton) (electron)
Like charges repel & unlike charges attract each other
When two different materials are rubbed against each other, one
loses electrons while the other gains these electrons. The object
which loses electrons becomes positively charged while the other
which gains electrons becomes negatively charged.
, Method of charging an object
Charging by friction:
The method of charging an object by rubbing two objects made
of different materials
The electrical charges produced by rubbing are called static
charges. When charges move, they constitute an electric current.
Electroscope
A device used to detect electric charges
Objectives: To
1) define lightning and its causes
(2) define an Electric charge
(3) test for the charges on an object
(4) define an earthquake and its causes
Charges
Positive charge Negative charge
(proton) (electron)
Like charges repel & unlike charges attract each other
When two different materials are rubbed against each other, one
loses electrons while the other gains these electrons. The object
which loses electrons becomes positively charged while the other
which gains electrons becomes negatively charged.
, Method of charging an object
Charging by friction:
The method of charging an object by rubbing two objects made
of different materials
The electrical charges produced by rubbing are called static
charges. When charges move, they constitute an electric current.
Electroscope
A device used to detect electric charges
