Download Quiz 9.1, 9.2 Study Guide

Quiz 9.1 and 9.2 Material-Study Guide
The buildup of charges on an object is called static electricity.
A complete, unbroken path through which electric charges can flow is an electric circuit.
Materials through which charge can flow easily are called conductors. (Ex: most metals)
Materials through which charge cannot flow easily are called insulators. (Ex: paper, cotton, rubber)
The ampere is a unit of electric current.
The unit of measure for resistance is called an ohm.
Electric charges that are different attract each other.
Electric charges that are the same repel each other.
The charge on the electron of an atom is negative, and the charge on a proton is positive.
The transfer of electrons from one uncharged object to another uncharged object by rubbing the two
together occurs due to friction.
The loss of static electricity as electric charges transfer from one object to another is called static
discharge.
As the temperature of most conductors increases, the resistance increases.
The strength of the electric field of a charged particle becomes greater as the distance from the particle
decreases.
The following are ways by which charges can redistribute themselves to build up static electricity.
induction
conduction
friction
*Resistance can be affected by: wire length, wire diameter, material, and temperature.
As temperature increases, resistance increases. As diameter increases, resistance decreases. As length
increases, resistance increases. Conductors have less resistance than insulators.
Ex: If two wires of the same material have the same thickness but different lengths, the shorter wire will
have less resistance.
Circuits: In a flashlight, the battery is a source of electrical energy. The wires represent the path.
Be able to calculate the overall charge on objects, given the + and – charges.
Example: Balloon A is neutral because its charges cancel each other out. Balloon B has an overall charge of -3
Be able to determine if the charge is + or – based on the field lines.
(Negative- arrows point in
Positive-arrows point out)