Page 30 - Science Course 3 (Book 2)
P. 30
Mo9-L1a: What are Electrically Charged Objects?
An object that has lost one or more electrons A material in which electric charges cannot easily
has more protons than electrons and is positively move is an electric insulator.
charged.
Plastic, wood, and glass are examples of electric
An object that has gained one or more electrons insulators.
has more electrons than protons and is negatively
charged.
Key Concept A material in which electric charges easily move are
electric conductors.
What are Electrically Charged Objects?
Some of the best electric conductors are metals,
How do electrically charged objects differ? such as iron, copper, gold, and aluminum.
Electric Fields and Electric Forces
The force that two electrically charged objects apply
to each other is an electric force.
An electrically charged object tends to lose its
unbalanced charge after a period of time.
The loss of an unbalanced electric charge is an
electric discharge.
Electric discharges may happen slowly or quickly.
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