search
person
what is fermi energy

1 Answer

Fermi energy is the part of electron band diagram.Fermi energy is highest energy that the electron assume at T = 0 K. Fermi level comes in between conduction band and valance band. In case of insulator the energy gap between conduction band and valance band is high, In case of semiconductor energy gap is small, And in case of conductor energy gap is overlap.
thumb_up_alt 0 like thumb_down_alt 0 dislike

Related questions

Description : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

Answer : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero 

Description : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Answer : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna 

Description :  An energy signal has G(f) = 20. Its energy density spectrum is A) 20 B) 100 C) 400 D) 800  

Answer :  An energy signal has G(f) = 20. Its energy density spectrum is 400 

Description : Phantom loading for testing of energy meter is used (A) to isolate the current and potential circuits (B) to increase power loss during testing (C) for meters having low current ratings (D) to test meters having a large current rating for which loads may not be available

Answer : B

Description :

What is Time of Day tariff? How it help in energy conservation?

Answer : Time-off-day tariff:- In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff /also the tariff in which P.F. of industrial consumer is taken ... the rated load for longer times of the day their overall efficiency gets higher helping to conserve energy.

Description : What is mass energy equivalence? Give one example. Define mass defect and binding energy.

Answer : Mass energy equivalence:-   The physical principle that a measured quantity of energy is equivalent to a measured quantity of mass. The equivalence is expressed by Einstein's equation E = mc ... of energy that must be supplied to a nucleus to completely separate its nuclear articles (nucleons)

Description : What is renewable source of energy? State two examples for the same.

Answer : Renewable (Primary) Energy sources: It is defined as the sources that can be used again and again for the generation of electrical energy are called renewable.  Following are the some list ... ) and carbon dioxide  6. Geothermal Energy  Geothermal Electricity Production  7. Fuel Cells

Description : What is meant by energy meter constant?

Answer : Energy Meter Constant  A fixed value which is used when converting meter readings to actual energy use, especially when potential transformers and similar types of equipment are used in metering. For example, K=--------rev/Kwh

Description : What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these

Answer : What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these

Description : What supplies energy to move through a circuit?

Answer : A  potentiall  diffrence  provides  sunction  pressure.

Description : what is the source of energy for satellite ?

Answer : The source of energy for the satellites are its solar panels which generate power by themselves. But, to reach the orbit , it uses the fuel to push the rocket . It needs fuel to power the ... solar panels , hence solar power is produced which is ud=sed to power the internal use of satellite.

Description : What is the definition of wind energy?

Answer : Motion of atmosphere of earth is called wind and its kinetic energy is called wind energy

Description : What are the advantages and disadvantages of wave energy?

Answer : AdvantagesFree from pollutionAvailable for every timeThe water can reuse as drinking purposeDisadvantageMore costLarge maintenanceDifficult to constructAquatic life get affected

Description : What are the advantages and disadvantages of solar energy?

Answer : Free of costRenewable energyInextable solar energyLow energy densityHigh capital costMaintenance cost highDepends on weatherNeed to direction tracking

Description : What are the disadvantages of using solar energy?

Answer : High installation costEnergy density is depend on weatherSo it is low Not suitable in all areasMaintenance cost high

Description : What is the difference between renewable and nonrenewable energy sources?

Answer : Renewable energy sources are non-perishable, and Non-renewable energy sources are perishable sources. Non-Renewable energy sources are like  coal, oil,nuclear fuel etc. Renewable energy sources are :- wind, solar, tidal, Geo thermal etc.

Description : What are the different sources of renewable energy?

Answer : Solar Wind Tidal Geothermal

Description :

Answer : Fermi energy is the amount of energy which Must be given to an electron to move it to conduction band.

Description : How to Choose an Energy Saving Light Bulb?

Answer : Popular in Russia Ilyich's bulbs are becoming a thing of the past, giving way to more modern lamps, which, as the name suggests, are designed to help conserve energy. What are their advantages ... light bulb for certain conditions, which will last a long time and will be efficient enough to use.

Description : How to wake up full of energy?

Answer : How to wake up full of energy? How hard a winter morning is sometimes! Due to the lack of vitamins, oxygen, sunlight, and constant lack of sleep, we feel overwhelmed. Therefore, it is ... become a habit. And what could be better than the habit of having excellent health and beautiful appearance?

Description : Explain the procedure of detailed energy audit.

Answer : Detailed Energy Audit Detailed audit provides a detailed project implementation plan for a facility, since it evaluate all major energy using systems. This type of audit offers the ... Management aspects of design and operating data collection, field measurements, data analysis, and training

Description : Outline any four duties and responsibilities of energy manager.

Answer : Responsibilities and Duties of Energy Manager Responsibilities Prepare an annual activity plan and present to management concerning financially attractive investments to reduce energy costs Establish an ... and manner as may be provided in the regulations of the Energy Conservation Act.

Description : Illustrate the benefits of hydrogen energy as a future energy.

Answer : Benefits of Hydrogen Energy The use of hydrogen greatly reduces pollution. When hydrogen is combined with oxygen in a fuel cell, energy in the form of electricity is produced. This electricity can ... sources of fuel. This ideally means that you need less hydrogen to complete an enormous task.

Description : State various types of energy losses with their control measures in any utility.

Answer : Energy loss and control in any utility Energy saving opportunities in cooling tower (These measures will save electrical energy used in fan or pumps) 1. Follow manufacturer's recommended ... Preheating combustion air 10. Switching from steam to air atomization Switching to lower cost fuel

Description : Explain energy conservation and its importance.

Answer : Energy conservation Energy Conservation is the deliberate practice or an attempt to save electricity, fuel oil or gas or any other combustible material, to be able to put to additional use for ... are produced. e) Generally to relieve shortage and improve development. f) Advantage in PAT scheme.

Description : Classify energy sources with two examples each.

Answer : Types of energy Source  Primary energy source is an energy form found in nature that has not been subjected to any conversion or transformation process. The primary energy sources are derived from: the sun, ... energy sources: These sources can renew again and again. e.g Solar, Wind, Biomass, Hydro

Description : State two objectives of energy audit.

Answer : Objective of energy audit  To determine ways to reduce energy consumption per unit of product output or to lower operating costs. Energy Audit provides a bench-mark" (Reference ... effective use of energy throughout the organization. Provide detailed documentation for monitoring of energy use

Description : State the use of Lux Meter and Tachometer in energy audit.

Answer : Use of lux meter – to measure intensity of light Use of tachometer – to measure speed

Description : List four environmental benefits of wind energy.

Answer : Environmental benefits of Wind Energy 1. Renewable & Sustainable 2. Environmentally Friendly 3. Reduces Fossil Fuel Consumption 4. Small Footprint

Description : State any two units of energy.

Answer : Units of energy: Joule Calorie Kilowatt Kilowatt-hour Watt

Description : SEER: Seasonal Energy Efficiency Ratio (SEER)

Answer : SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ... the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.

Description : Briefly explain how an electrical generator converts mechanical energy into electrical energy.

Answer : Working principle of DC generator: * Working principle of DC generator is the principle of dynamically induced emf or electromagnetic induction. * According to this principle, when flux is cut by a conductor, an ... , the flux is cut by the armature winding and an emf is dynamically induced in it. 

Description : State the difference between energy conservation and energy audit. 

Answer : energy conservation Energy audit It is reducing the growth of energy consumption by avoiding unnecessary usage of energy It is an inspection, survey & analysis of energy flows ... Various measuring instruments, with proper sensing elements are required for the energy audit. 

Description : List the energy conservation technique in induction motor. 

Answer : Following are the list of energy conservation techniques in electrical motors: 1) Reduction in iron losses by using low loss silicon steel core material laminated to thinner dimension. 2) Using bigger length ... at light load. 13) By rewinding in induction motor 14) By motor survey

Description : Define Energy conservation. 

Answer : Energy conservation:  Reduction in the amount of energy consumed in a process or system, or by an organization or society, through economy, elimination of waste, and rational use is referred ... electrical power and to increase the efficiency of every machine and material by minimizing the losses.

Description : State the Principle of energy conservation.

Answer : Principle of energy conservation: The law of conservation of energy states that the total energy of an isolated system remains constant-it is said to be conserved over time. Energy can neither be ... due to burning of fuels, greenhouse gases and avoid harmful effects on all livings on earth. 

Description :

Blackt Electrotech 230V 24x7 Energy Saving Socket Type Digital Programmable Plastic Electronic Timer (White)

Answer : Buy from amazon: https://amzn.to/2SUTSdv Buy: http://bit.ly/2ZqlAkS

Description : Energy stored in electrostatic field of capacitance formula

Answer : Energy stored in electrostatic field of capacitance formula

Description : Energy stored in capacitor examples

Answer : Energy stored in capacitor examples

Description : Problems on electrical power and energy

Answer : Problem on electrical power and energy 1 : https://youtu.be/ZvWHuMdmv9g Problem on electrical power and energy 2 : https://youtu.be/19IZMc6U2vs Problem on electrical power and energy 3 : https ... : https://youtu.be/iYqGIwA919A Problem on electrical power and energy : https://youtu.be/iWnWQz_mzHk

Description : Problem on electrical power and energy 2

Answer : Problem on electrical power and energy 2

Description : Problem on electrical power and energy 1

Answer : Problem on electrical power and energy 1

Description : Problem on electrical power and energy 7

Answer : Problem on electrical power and energy 7

Description : Problem on electrical power and energy 6

Answer : Problem on electrical power and energy 6

Description : Problem on electrical power and energy 5

Answer : Problem on electrical power and energy 5

Description : Discuss how power factor tariff results into energy conservation.

Answer : Power factor tariff results into energy conservation: i) Applying incentives and penalties according to power factor is an effective way, which enables consumer to improve power factor so that he can ... finally leads to reduction in the current drawn by the load and helps for energy conservation.

Description :

Explain the need of energy conservation in present scenario.

Answer : Need of energy conservation in present scenario: 1. Fossil fuels like coal, oil which have taken no. of years to form and now they are on the verge of depleting soon. 2. In last ... protection and integrated economic and social development. 9. Energy saved is as good as energy generated. 

Description : Explain stepwise the “Detailed energy audit” procedure.

Answer : A) Start up meeting: For this programme, we proceed with this meeting. If then continue us until implementation of energy saving measures. B) Analysis of energy used: Identify where ... are considered, the analysis of energy loss and measurement of insulation level is also considered.

Description : Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses. 

Answer : Energy conservation techniques to reduce commercial losses:  1. Mitigation of Power Theft: Power theft being the most important issue which all of the service providing utilities ... agricultural sector. Prepaid meters may prove effective measures against unauthorized abstraction of energy. 

Description :

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

← Prev Question Next Question →
editAsk a Question
...