RAD4046 (Topic 3): Resistance relationships

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what happens when you increase temperature in a conductor?

increased resistance, temp has to be kept low as possible as possible to maintain low resistance for a conductor
what happens when temperature is too high in a insulator?

increase in resistance, melts the fuse as it is too hot so too much current causes circuit to break.
state the application of liquid nitrogen in a diagnostic medical setting

used in MRI units (type of cryogen to maintain high current), circuits.
define the term conductor

permits the easy flow of electrons like metals, water so lads to a number of free electrons present.
define semi conductor

permits the flow in one direction only which is needed for regulation flow in a circuit e.g. silicon.
describe the difference between alternating current (AC) and direct current (DC)
- alternating current- flows forwards and backwards so alternate,
- direct current- e.g. a battery which flows in one direction only.
describe what occurs at cathode assembly

the anode is positive made, this is done by free electrons being attracted to anode at higher speeds.
state the units for the following:
electrical charge, electrical potential, electric current, resistance, energy, power

coulomb, volt (or KVMV), Amp (or mA), ohm, joule (VIT), watt (VI)

Author

saaram02

357127

Card Set

RAD4046 (Topic 3): Resistance relationships

Description

looking at resistance relationships, difference between types of conductors, difference between alternating and direct current with some definitions for electrical units.

Updated

2021-12-09T19:39:37Z

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