# Shared Flashcard Set

## Details

PH Concepts in Action CH 20
Electricity
47
Physics
03/18/2009

Term
 Electric Charge
Definition
 property that causes charged particles to attract or repel
Term
 What are the two electric charges a particle can have?
Definition
 positive or negative
Term
 What causes an electric charge?
Definition
 the gain or loss of electrons
Term
 Two positive charges will _________ each other.
Definition
 repel
Term
 Two negative charges will _________ each other.
Definition
 repel
Term
 A positive and a negative charge will __________ each other.
Definition
 attract
Term
 electric force
Definition
 force of attraction or repulsion between two charge atoms
Term
 Name two things that affect the strength of an electric force between two objects:
Definition
 net charge of the objects AND distance betweent the two objects
Term
 Electric field
Definition
 affect an electric charge has on other charges around it
Term
 Name two things that affect the strength of an electric field.
Definition
 amount of charge of the field and the distance from the charge
Term
 Name the three ways charge can be transfered:
Definition
 friction, contact, and induction
Term
 Which form of charge transfer can be done without touching the objects?
Definition
 induction
Term
 Which form of charge transfer is due to two objects rubbing against each other?
Definition
 friction
Term
 How does static in your laundry form?
Definition
 friction
Term
 What is lightning is an example of _____.
Definition
 static discharge
Term
 What is static discharge?
Definition
 when a pathway to discharge an electric charge forms suddenly
Term
 The law of conservation of charge states that the amount of charge before a transfer must ______________.
Definition
 equal the amount of charge after the transfer.
Term
 What flows in an electric current?
Definition
 electric charge
Term
 What are the two types of current?
Definition
 AC and DC
Term
 AC stands for
Definition
 Alternating Current
Term
 DC stands for
Definition
 Direct current
Term
 What type of current is found in your wall outlet?
Definition
 AC
Term
 What type of current is found in a battery operated device>?
Definition
 DC
Term
 Something that electric charge does NOT flow through easily is a
Definition
 insulator
Term
 Give two examples of materials that make good electrical insulators
Definition
 glass, wood, rubber, plastic, air
Term
 Give two examples of materials that make good electrical conductors
Definition
 metals, saltwater
Term
 A material that DOES transfer electric charge well is called a
Definition
 conductor
Term
 What is electrical resistance?
Definition
 the opposition (not allowing) flow of electrical charge
Term
 What is the unit of resistance
Definition
 Ohm
Term
 what is the unit of current?
Definition
 ampere (amp)
Term
 What is the unit of potential difference?
Definition
 voltage
Term
 Name three things that affect a materials resistance
Definition
 1. thickness of material2. length of material (such as a wire)3. temperature of the material
Term
 What is a superconductor?
Definition
 a material that has almost zero resistance at cold temperatures
Term
 What is potential difference?
Definition
 the difference in potential energy in two places on the same circuit
Term
 What do you use to measure potential difference?
Definition
 voltage
Term
 Name 3 voltage sources:
Definition
 batteries, generators, and solar cells
Term
 In Ohm's Law: V = I x R if you increase V what happens to R?
Definition
 R increases?
Term
 In Ohm's Law: V = I x R if you increase I what happens to R?
Definition
 R decreases?
Term
 What do all of the variable stand for in Ohm's law? V= I x R?
Definition
 V= voltageI = current/ampsR = Ohms/resistance
Term
 What are circuit diagrams?
Definition
 Diagrams that draw or show all of the parts of a complete circuit using symbols
Term
 Know the symbols for the electric circuit diagrams of: ammeter voltmeter wire bulb resistance switch battery
Definition
 [image]
Term
 [image]What kind of circuit is this diagram?
Definition
 Series circuit with 2 bulbs, and a battery
Term
 What kind of circuit is in this diagram?[image]
Definition
 Parallel Circuit with two bulbs and a battery.
Term
 Electric Power
Definition
 the rate at which electrical energy is converted into a different energy (light, heat)
Term
 What is the unit used to measure electrical power?
Definition
 Watt
Term
 Name three things that are used in electrical safety:
Definition
 fusescircuit breakersGFI -ground fault interupted outlets
Term
 Grounding
Definition
 transfer of excess charge through a conductor
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