Electricity And Magnetism

Front 1

electrical forces

Back 1

are created by atomic particles

Front 2

electrical charge

Back 2

is a fundamental physical property of matter, either positive or negative; like charges repel and unlike charges attract; electrical field- may overlap with other charged particles and repel or attract

Front 3

insulators

Back 3

prevent the flow of electric current (wood, rubber)

Front 4

conductors

Back 4

allow electricity to pass through (metals)

Front 5

electric current

Back 5

is the flow of loose electrons in an electric circuit

Front 6

conductivity

Back 6

the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current

Front 7

direct current

Back 7

charges always flow in the same direction, positive to negative; electrons are repelled from the negative terminal and attracted to the positive terminal

Front 8

alternating current

Back 8

the charges continually alternate or reverse directions; measured in Hertz

Front 9

electric circuit

Back 9

a pathway that allows electrons to flow

series circuit- provides only one pathway for electrons to flow; amount of current is the same throughout

parellel circuit- contains branches, providing more than one path for current to flow through

Front 10

resistance

Back 10

is the opposition to the flow of electric current by a device (light, wire), measured in Ohms

Front 11

Ohm's law

Back 11

states that the current through a conductor between two points is directly proportional to the potential difference across the two points

Front 12

voltage sources

Back 12

batteries and generators; designed to provide a steady flow of charge by separating positive from negative charges; send electric current opposite direction

Front 13

electromagnetic field

Back 13

combination of electric (stationary charges) and magnetic field (moving charges); measured by gaussmeter

Front 14

magnets

Back 14

have the ability to exert attractive and repulsive forces on magnetic materials; two magnetic poles

Front 15

electromagnet

Back 15

creates a stronger magnetic field than either the magnet or the solenoid alone; solenoid- is a conduction coil of wire

Front 16

attraction

Back 16

north and south magnetic poles attract; repulsion of like charges