Ch10 A-level Physics CIE
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19 Terms
The current through the conductor is proportional to the potential difference across its ends
State Ohm's Law
Ohmic conductor
What kind of conductor?
Constant
For a metal to obey ohm's law, what must be true about its temperature?
Filament lamp
What kind of conductor?
Increases
As the current increases, what happens to the resistance of a filament lamp?
Thermistor
What is the name of the electrical component whose resistance is greatly affected by its temperature?
Thermistor
What kind of conductor?
Diode
What kind of conductor?
Decreases
As the current increases, what happens to the resistance of a diode?
Threshold voltage
What is the name of the voltage below which no current will flow in a diode?
0.6 V
No current will flow in diode unless the pd is higher than approximately...
Vibrate faster
What happens to the ions in a metal as the temperature increases?
Increases
What happens to the number of collisions between conduction electrons and ions when the temperature increases?
Increases
What happens to the resistance of a metal when the number of collisions between electrons and ions increases?
Increases
What happens to the number of conduction electrons inside a semiconductor as the temperature increases?
Decreases
What happens to the resistance of a semiconductor as the temperature increases?
Resistivity
Which word means the property of a material that is similar to its resistance, but doesn't depend on its length or cross-sectional area?
R = ρ l / A
The equation that links resistance, length and area
Ωm
The units of resistivity
