Keywords Electricity Flashcards
Learning Keywords
What is meant by the term internal resistance?
Its the name given to the resistance inside an emf source.
What does emf stand for?
Electromotive Force
What is meant by a semiconductor?
Materials with a lower resistivity than insulators, but higher than conductors. They usually only have small numbers of delocalised electrons that are free to conduct.
What is meant by the term: valence band?
A valance band is a range of energy amount that electrons in a solid material can have which keeps them close to one particular atom.
What is meant by the term: conduction band?
The conduction band is a range of of energy amounts in a solid material can have which delocalises them to move more freely through the solid.
What is the critical Temperature?
The temperature below which a material’s resistivity drops to zero.
What is meant by the term superconductivity?
It’s the electrical property of a material having zero resistivity.
What is potential difference?
For a component that is using electrical energy the correct term for the voltage is potential difference
If current is …….. to ………. the component is called an ohmic conductor.
Proportional
voltage
Describe a filament bulb
A filament bulb is an example of a non-ohmic conductor, this is because the current affects its own temperature and controlling temperature is part of the definition of Ohm’s law.
What die fuoco is electromotive force?
Voltage of the electrical energy being put into a circuit
What is the purpose of a thermistor?
A thermistor is designed tom alter its resistance with temperature, the reverse manner to a filament bulb.
What is the main characteristic of a diode?
A diode is designed to only pass current in one direction, so the line follows the x-axis, l=0 for negative voltages.
