Classification Of Metals , Conductors And Semiconductors
Chapter Name : Semiconductor Electronics: Materials, Devices And Simple Circuits |
Sub Topic Code : 101_12_14_02_01 |
Topic Name : Classification Of Metals , Conductors And Semiconductors |
|
Sub Topic Name : On The Basis Of Conductivity |
|
Introduction
A measure of a material's ability to conduct an electric current.
Pre-Requisites:
Conductivity
Activity:
In metals, the Fermi level lies in the conduction band giving rise to free conduction electrons.
Real Life Question:
How do we determine the Conductivity of a substance?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Conductivity | A measure of a material's ability to conduct an electric current. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Resistors or conductors with uniform cross-section. | The reason resistivity is defined this way is that it makes resistivity a material property, unlike resistance. |
Real life uses :
Bulbs.
Places to visit :
Refrigerator, electric bulb etc.
Practical examples around us
| Examples | Explainations |
|---|---|
| Intrinsic semiconductor | At room temperature, the conductivity of intrinsic semiconductors is relatively low because there are very few charge carriers available. |
What you learn in Theory:
Conductivity (electrolytic) is a measurement of the electrical conductance per unit distance in an electrolytic or aqueous solution.
What you learn in Practice:
Conductivity measurements are used routinely in many industrial and environmental applications as a fast, inexpensive and reliable way of measuring the ionic content in a solution.