Distinguish between AC and DC.

Distinguish between AC and DC.
by

2 Answers

Answer :

Alternating current (AC) Direct current (DC)
The direction and magnitude of AC changes. The direction and magnitude of DC is constant.
AC have power factor between 0 and 1. DC always have a power factor of 1.
AC have finite frequency.  DC have a zero frequency.
AC is obtained from alternator. DC is obtained from battery, solar cell, DC generator etc.
The passive parameter is impedance denoted by Z. The passive parameter is resistance denoted by R.
The direction of electrons flow changes forward and backward. The direction of electrons flow is steady i.e. forward.
There are different waveform types of AC like sine wave, square wave, triangular wave etc. There are only two types in DC one is pure DC and second is pulsating DC.
Step up and step down of AC is very easy using transformer. Step up and step down of DC is not very easy because we can not use transformer with DC.
Transmission cost of AC is low as compared to DC. Transmission cost of DC is high as compared to AC.
We can easily obtained DC from AC using rectifier. We can obtained AC from DC but the inverter circuit is difficult.
We can not store AC. We can store DC in battery.
Generation of AC using large alternators is economical. Generation of DC using large DC generator is not economical.
image image


by
edited

Answer :

Particulars
Direct Current
Alternating Current
Definition
It is the current whose magnitude and direction do not change with respect to time.
It is the current whose magnitude and direction continuously changes with respect to time.
Use of transformer
Not possible
Possible
Design of machines
Complicated
Simple
Frequency
Zero
It is 50 Hz or 60 Hz depending upon country.
Obtained from
Battery, Cell and DC Generator
Alternator
Passive parameters 
Resistance only
Resistance, Inductance, Capacitance.
Applications
DC machines, HVDC system, electroplating, Battery charging, Traction.
AC machines, Domestic and industrial supply.
by

Related questions

What is the difference between an AC and DC generator?

Description : What is the difference between an AC and DC generator?

Last Answer : The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

What is the difference between AC and DC drive?

Description : What is the difference between AC and DC drive?

Last Answer : AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz

Describe the difference between direct and alternating current.

Description : Describe the difference between direct and alternating current.

Last Answer : Direct current is the flow of electricity or charge in one direction..  Alternative current is the flow of charge that doesn't flow in one direction. 

what is the different between AC and DC current ?

Description : what is the difference between AC and DC current ?

Last Answer : AC is generated using Alternator. DC is generated using DC generator. AC changes its direction periodically. DC do not change its direction periodically. AC have non zero frequency. DC have zero ... Power factor of AC is between 0 and 1. But power factor of DC is always 1.

Describe the difference between an open circuit and a short circuit.

Description : Describe the difference between an open circuit and a short circuit.

Last Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Write difference between absolute & secondary instrument.

Description : Write difference between absolute & secondary instrument.

Last Answer : Absolute Instrument Secondary Instrument 1. These give magnitude of quantity in terms physical constants of instruments 1. These give reading directly of the quantity at the time of ... Raleigh current balance. 6. Examples - ammeter, voltmeter, amperehour meter, wattmeter etc.

What is the difference between eddy current and hysteresis loss?

Description : What is the difference between eddy current and hysteresis loss?

Last Answer : Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

What is the difference between an anode and a cathode?

Description : What is the difference between an anode and a cathode?

Last Answer : The anode is positively charged electrode and the cathode is negatively charged electrode.

What is the difference between a coil and an inductor?

Description : What is the difference between a coil and an inductor?

Last Answer : Inductor is covering with insulating material is called coil.so they differentiate between coil and inductor.

State the difference between energy conservation and energy audit.

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

Last 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. 

What is the difference between relay and contactor?

Description : What is the difference between relay and contactor?

Last Answer : Relay have smaller ratings. Contactor is a high rating relay.

In a single phase power factor meter the phase difference between the currents in the two pressure coils is?

Last Answer : In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

A differential relay measures the vector difference between?

Last Answer : A differential relay measures the vector difference between two or more similar electrical quantities.

What is the difference between BJT and FET?

Description : What is the difference between BJT and FET?

Last Answer : BJT  is  a  current  opperated   transistor  while  FET   is  a  field   opperated  transistor.

What is the difference between synchronous and asynchronous motors?

Description : What is the difference between synchronous and asynchronous motors?

Last Answer : The motor which rotates at constant speed is called synchronous motor. And that constant speed is called as synchronous speed.  And the motor which does not rotates at constant speed are called asynchronous motor. Asynchronous motor is also called as Induction motor.

What is the difference between an insulator and a dielectric?

Description : What is the difference between an insulator and a dielectric?

Last Answer : Dielectric is the another name for insulator.

What is the difference between a microcontroller and a microprocessor?

Description : What is the difference between a microcontroller and a microprocessor?

Last Answer : Compare microprocessor and microcontroller Microprocessor Microcontroller 1)Inbuilt RAM and ROM 1)Do not have inbuilt RAM or ROM 2)Inbuilt timer 2)Doesn't have inbuilt timer ... same memory 6)Many Multifunction pins on the IC  6)less multifunction Pins on IC.

What is the difference between line and phase current?

Description : What is the difference between line and phase current?

Last Answer : The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current

What is the difference between line and phase voltage?

Description : What is the difference between line and phase voltage?

Last Answer : Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

What is difference between KW and KVA?

Description : What is difference between KW and KVA?

Last Answer : kW is kilowatt and kVA is kilovolt ampere. kW is unit of real power and kVA is unit of Apparent power.

Give the circuit analysis of current source inverter with resistive load.

Description : Give the circuit analysis of current source inverter with resistive load. What are the main difference between voltage source inverter and current source inverter?

Last Answer : Current source inverter (CSI): In current source inverter, the output current is independent of load. The input current of current source inverter is constant. Current source converter converts DC input current to ... are connected in parallel. In CSI diodes are connected in series.

What is difference between Star and Delta Connection?

Description : What is difference between Star and Delta Connection?

Last Answer : Star is        1. Open ckt       2. At center point present  neutral   Delta is     1.   Closed ckt 2.      Neutral not present in this case 

What is the difference between a counter and a timer?

Description : What is the difference between a counter and a timer?

Last Answer : Counter counts only when the trigger is applied and timer counts continuously with some equal delay.

What is the difference between renewable and nonrenewable energy sources?

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

Last 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.

What is the difference between a switch and a relay?

Description : What is the difference between a switch and a relay?

Last Answer : Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .

What is the difference between forward and reverse bias?

Description : What is the difference between forward and reverse bias?

Last Answer : Forward bias is a PN junction bias which allows current to flow through the junction. Forward bias decreases the resistance of the depletion layer. Reverse bias is a PN junction bias that allows only ... Positive polarity on the n-type material and negative polarity to the p-type material.

Why are DC motors used in trains and not AC motors ?

Description : Why are DC motors used in trains and not AC motors ?

Last Answer : The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is zero..so it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

Why is AC considered more efficient than DC?

Description : Why is AC considered more efficient than DC?

Last Answer : Ac is more efficient than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transmission. When fault occurs it is easy to interrupt ac supply.

Which is more dangerous AC or DC and why ?

Description : Which is more dangerous AC or DC and why ?

Last Answer : Dc is more dangerous than Ac because in Ac the voltage  will varies but in dc the constant voltage 

What is the conversion between. AC to AC ? DC to DC? AC to DC? DC to AC ?

Description : What is the conversion between. AC to AC ? DC to DC? AC to DC? DC to AC ?

Last Answer : 1.ac to ac is regulation 2.dc to dc is chopper 3.ac to dc is rectifier 4.dc to ac is inverter

Is the power line voltage available in our homes a dc or an ac voltage?

Description : Is the power line voltage available in our homes a dc or an ac voltage?

Last Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

The main advantage of AC over DC is:

Description : The main advantage of AC over DC is:  (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above

Last Answer : Ac is easy to maintain and ac can be easily converted to dc by rectifier .There is no commutator for conversion in ac that's why ac machines are weight less and more efficiency.ac machines occupy less space than dc .

Which of the following motors can run on both AC and DC?

Description : Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

Last Answer : Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

Do cell phones use AC or DC current?

Description : Do cell phones use AC or DC current?

Last Answer : DC of course.

Is current from a battery AC or DC?

Description : Is current from a battery AC or DC?

Last Answer : The current from the battery is DC

How IGBT convert DC into AC in solar inverter?

Last Answer : Igbt alone cant convert dc to ac. igbt half bridge or full bridge or three phase topology could be used to convert dc to ac. also igbt gates should be driven by microcontroller or pwm/spwm gate driving signals ... e4(-) and g4 c2e1 and c4e3 pins are AC output pins. its name is igbt inverter.

are AC and DC resistances same?

Description : are AC and DC resistances same?

Last Answer : Resistance is the ability of a circuit or element (which is called resistor) to oppose current. Examples of Resistors with the ability of high resistance are Wood, Air, Mica, Glass, Rubber, Tungsten ... constant. Therefore, only the original resistance of wire comes into play. they are not the same

State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Description : State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Last Answer : Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows:  1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine 

Compare the AC and DC Arc lamps.

Description : Compare the AC and DC Arc lamps.

Last Answer : AC Arc Lamp DC Arc Lamp Cross section area of electrode is same Cross section area of electrode is positive rod is twice that of negative rod Series inductor is used for stability ... supply is used for DC arc lamp Luminous efficiency is less Luminous efficiency is high

is it DC better than AC to transmit? explain it.

Description : Do you think is DC better than AC to transmit energy?

Last Answer : In Long distance DC transmission will be better in cost. It requires more equipments for flexiblity In short distance AC transmission is better in  cost. It is more Flexible

How is a thyristor used to convert AC to DC?

Description : How is a thyristor used to convert AC to DC?

Last Answer : thyristor

Is electricity generated in AC or DC?

Description : Is electricity generated in AC or DC?

Last Answer : Electricity   is  generated  in  AC.

Is it AC or DC electricity in the home?

Description : Is it AC or DC electricity in the home?

Last Answer : Obviously its A.C

Can transformer convert AC to DC?

Description : Can transformer convert AC to DC?

Last Answer : No, Transformer cannot convert AC to DC.

can rectifier convert dc to ac?

Last Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.

how does rectifier convert ac to dc?

Last Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

is induction motor ac or dc?

Last Answer : Induction motor is a AC motor it is also known as asynchronous motor .

Changeover from D.C to A.C

Description : Changeover from D.C to A.C  

Last Answer : In later half of eighties, in nineteenth century, it was proposed to have a power system with 3- phase, 50 Hz A.C generation, transmission and distribution networks. Once a.c system was adopted, transmission of ... favor of A.C supply system own the debate on switching over from D.C to A.C system. 

State any four advantages of A. C. over D. C .

Description : State any four advantages of A. C. over D. C . 

Last Answer : Advantages of AC over DC: i) It is possible to use a transformer. ii) Distribution efficiency is high. iii) Generation is easy and economical. iv) Construction of ac equipment/ machines is robust and simple ... . vii) AC system is economical than DC system. viii) AC system is safer than DC system.

All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

Description : All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

Last Answer : All the rules and laws of D.C. circuit also apply to A.C. circuit containing resistance only.