Table of Contents
Why tin is not a semiconductor?
Tin has a very large atomic radius hence the distance between valence electrons and nucleus is very large. Hence ionisation energy is very low such that the valence band and conduction band merge with each other.
Why carbon is an insulator while germanium and silicon are semiconductor?
Why Carbon acts as insulator while Silicon and Germanium act as semiconductors? It results in the comparatively higher ionization energy for carbon and least for Germanium. Hence, the number of free electrons responsible for conduction is significantly more in Germanium and silicon as compared to Carbon.
Why is carbon an insulator?
Why SN is a conductor?
Sn is a conductor as it has an energy gap of 0 EV while C has an energy gap of 5.4 eV therefore, it is an insulator. Si and Ge have an energy gap of 1.1 eV and 0.7 eV, which makes them a semiconductor.
Why carbon is not a good conductor of electricity?
Answer: Carbon compounds are poor electrical conductors because they form covalent bonds, and they do not give rise to free electrons because all electrons are used to create the covalent bond. Also carbon compound does not dissociate itself into ions, so carbon compounds are poor electrical conductors.
Why carbon is used as a resistor?
The big advantage of carbon composition resistors is their ability to withstand high energy pulses. When current flows through the resistor, the entire carbon composition body conducts the energy. Carbon resistors can be made with a higher resistance than wirewound resistors and are considerably cheaper.
What is the resistance of carbon resistor?
The resistance of the given carbon resistor is (2. 4×106±) 5\% Ω.
Why is carbon not used as a semiconductor?
Carbon is not used as semiconductor it has 4 valence electrons in it valence shell but the energy gap is very small it will conduct electricity even at room temperature ,the size of carbon is very small . It depends upon the structure of carbon.In case of germanium and silicon they have d orbits in the outer shell and they have greater mobility.
Why carbon composition resistors are not used anymore?
However, now-a-days, carbon composition resistors are rarely used because of its high cost and low stability. The carbon composition resistors are also called carbon composition or carbon resistors.
Why does graphite conduct electricity?
However, graphite, another allotrope of carbon, conducts electricity very well because it has an entire “sea” of free electrons. It displays properties of both metals, and nonmetals.
What is the internal structure of a carbon resistor?
The internal structure of a carbon resistor is shown in the image below. The carbon resistor contains carbon coated onto a ceramic core. A spiral is etched on the deposited carbon which turns it into a wire wound on a ceramic core. Depending on the resistance required, pitch, diameter and length of the carbon spiral vary.