Topic 2 Resistance And Iv Characterisics Flashcards
What do ohmic conductors have
Constant resistance
At a constant temperature what is the current flowing through an ohmic resistor
Directly proportional to the potential difference
Ohmic conductor graph
Look on paper
What happens when an electrical charge to flows through a filament lamp
It transfers through the thermal energy store of the filament which is designed to heat up
As resistance increases with the temperature so as the current increases …
The filament lamp heats up and the resistance increases
When will a current flow through a diode
If it only flows in one direction
What happens to the diode in reverse direction
The resistance is very high
Filament lamp graph
Look at paper
Diode IV graph
Look at paper
What do ohmic conductors have
A high constant resistance
What happens to the resistance of ohmic conductors when current changes
It doesn’t change
At a constant remo the current flowing through an ohmic conductor is
Directly proportional to the potential difference across it
What components do their resistance change
Diode
Filament
What happens when an electrical charge flows through a filament lamp
It transfers some energy to the thermal energy store of the filament which is designed to heat up
Resistance increases with temperature so as the current increases the filament lamp heats up more and resistance increases
Resistance in diodes
Depends on the direction of the current
Will flow easily one way but have high resistance if it is reversed
