MRI (ELECTRIC)

ELECTRODYNAMICS

The science of electricity charge in motion

ELECTRIC CURRENT

A flow of electric charge.

Closed Circuit

For an electric current

to exist, a (?) is necessary.

DIRECT CURRENT

If the energy source propels electrons in only one direction. (ex. Battery, Xray tube)

ALTERNATING CURRENT

If the energy source is in two or more direction. (ex. MRI)

PHASE

All electrons are moving in the same direction with the same velocity.

OHM’S LAW

The voltage across the total circuit or any portion of the circuit is equal to the current times

the resistance.

Impedance

Electrons bump into other electrons of the conductor. (resistive)

Capacitive, Inductive, Resistive

3 TYPES OF ELECTRIC IMPEDANCES

Resistive

changes the electric energy into heat

INSULATORS

stop flow of electrons/ resist

Quartz, Rubber, Glass

types of insulators

CONDUCTORS

Allows flow of electrons but w/ resistance

Copper, Aluminum, Seawater

Types of conductors

SEMICONDUCTORS

Acts as Insulator/Conductor

Silicon, Selenium, Germanium

types of semiconductors

SUPERCONDUCTORS

The electric resistance of a material is zero, must be in cryogenic environment

Titanium,niobium

type of superconductor

ELECTRIC POWER

Ability to do work by Using Energy

Scattering, and Absorption

Types of Attenuation