Electric Charge and Static Electricity Page 682

Electric Charge Charged parts of atoms are electrons and protons. Charges that are the same repel each other. Charges that are different attract each other.

Electric Force The attraction or repulsion between electric charges.

Electric Field A region around a charged object where the object’s electric force is exerted on other charged objects.

Electric field around a single charge: The electric field around a positive charge points outward. The electric field around a negative charge points inward.

Electric Field around Multiple Charges The electric fields around charged particles are combined when they are brought near each other.

Static Electricity The buildup of charges on an object. Charges do NOT flow continuously.

Transferring Charge The law of conservation of charge states that an object becomes charged only when electrons are transferred from one location to another; charges are neither created nor destroyed.

Charging by FRICTION The transfer of electrons from one uncharged object to another by rubbing (Ex: rubbing socks on carpet).

Charging by CONDUCTION The transfer of electrons from one charged object to another by DIRECT CONTACT (Ex: - charge sock touching skin).

Charging by INDUCTION The movement of electrons to one part of an object that is caused by the electric field of a second object.

Detecting Charge Electric charge is invisible, but it can be detected by an instrument called an electroscope.

Static Discharge When a negatively charged object and a positively charged object are brought together, electrons transfer until both objects have the same charge.

Closure - Magnetism vs. Electricity

Magnetism vs. Electricity Magnetic poles cannot exist alone Electric charges can exist alone Like repel; Different attract