Do cell phones use AC or DC current?

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.

5.3k views 4 answers

asked Jun 29, 2019 by anonymous

What is the advantage of AC over DC electrical transmission?

82 views 0 answers

asked Apr 26, 2020 by anonymous

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

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.

160 views 1 answer

asked Sep 3, 2019 by anonymous

Why is AC considered more efficient than DC?

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.

99 views 1 answer

asked Aug 28, 2019 by anonymous

Which is more dangerous AC or DC and why ?

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

150 views 2 answers

asked Aug 28, 2019 by anonymous

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

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

100 views 1 answer

asked Aug 15, 2019 by anonymous

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

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.

5.2k views 1 answer

asked Jun 29, 2019 by anonymous

Distinguish between AC and DC.

Distinguish between AC and DC.
Last 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 ... system, electroplating, Battery charging, Traction. AC machines, Domestic and industrial supply.

462 views 2 answers

asked Aug 8, 2018 by anonymous

The main advantage of AC over DC is:

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 .

143 views 2 answers

asked May 8, 2018 by anonymous

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

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

179 views 1 answer

asked Apr 29, 2018 by anonymous

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.

185 views 1 answer

asked Feb 24, 2018 by Amit Sharma

are AC and DC resistances same?

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

82 views 1 answer

asked Oct 18, 2017 by anonymous

Alternating current (AC)

Alternating current (AC)
Last Answer : AC stands for Alternating Current meaning voltage or current that changes polarity or direction respectively over time. An Alternating Current (AC) is an electric current whose magnitude ... energy are known as alternators and are simpler construction than DC electromechanical generators.

181 views 2 answers

asked Nov 22, 2019 by anonymous

How does AC current change direction?

How does AC current change direction?
Last Answer : This is because the angle at which the magnetic fields cuts across a winding changes its poles thus current has to change dirention .

92 views 1 answer

asked Mar 14, 2018 by anonymous

What is the direction of an AC current?

What is the direction of an AC current?
Last Answer : The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.

2.6k views 2 answers

asked Mar 14, 2018 by anonymous

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

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

378 views 1 answer

asked May 7, 2020 by anonymous

Compare the AC and DC Arc lamps.

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

247 views 1 answer

asked May 3, 2020 by anonymous

How to convert 12v dc to 12v ac

2.6k views 0 answers

asked Jul 25, 2019 by anonymous

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

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

466 views 2 answers

asked Aug 11, 2018 by nbattack

How is a thyristor used to convert AC to DC?

How is a thyristor used to convert AC to DC?
Last Answer : thyristor

123 views 1 answer

asked Mar 19, 2018 by anonymous

What is the difference between an AC and DC generator?

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.

315 views 1 answer

asked Mar 15, 2018 by anonymous

Is electricity generated in AC or DC?

Is electricity generated in AC or DC?
Last Answer : Electricity is generated in AC.

129 views 1 answer

asked Mar 10, 2018 by anonymous

What is the difference between AC and DC drive?

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

156 views 1 answer

asked Mar 10, 2018 by anonymous

Is it AC or DC electricity in the home?

Is it AC or DC electricity in the home?
Last Answer : Obviously its A.C

200 views 4 answers

asked Mar 10, 2018 by anonymous

Can transformer convert AC to DC?

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

3.0k views 9 answers

asked Dec 9, 2017 by anonymous

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.

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asked Sep 13, 2017 by anonymous

how does rectifier convert ac to dc?

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

139 views 2 answers

asked Sep 13, 2017 by anonymous

is induction motor ac or dc?

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

97 views 1 answer

asked Sep 9, 2017 by anonymous

Direct Current (DC)

Direct Current (DC) Next Topic : Alternating current (AC)
Last Answer : Direct Current (DC) is the unidirectional electric current. Uni meaning is one. And the flow of charge in same direction. We know that conventional current flow from positive terminal of battery to ... The magnitude of DC may constant or vary but direction do not change with respect to time.

220 views 3 answers

asked Nov 22, 2019 by anonymous

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is
Last Answer : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

329 views 1 answer

asked May 3, 2018 by anonymous

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : (A) 256 W (B) 320 W (C) 500 W (D) 625 W
Last Answer : The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

103 views 1 answer

asked Apr 30, 2018 by anonymous

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is
Last Answer : Please show the solution for this question

515 views 2 answers

asked Apr 29, 2018 by anonymous

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
Last Answer : 45

833 views 2 answers

asked Mar 24, 2018 by anonymous

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a?

Last Answer : The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

173 views 1 answer

asked Mar 21, 2018 by anonymous

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?

Last Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

366 views 1 answer

asked Mar 20, 2018 by anonymous

Changeover from D.C to A.C

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.

2.4k views 1 answer

asked Aug 8, 2019 by anonymous

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

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.

123 views 1 answer

asked Sep 4, 2018 by anonymous

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

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.

245 views 1 answer

asked Mar 25, 2018 by anonymous

Resonance in a circuit occurs when the inductive reactance is equal to the capacitive reactance ?

TRUE OR FALSE

4 views 0 answers

asked Jul 30, 2021 by siyanda mtati

If a D.C. motor is connected across the A.C. supply it will?

Last Answer : If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.

102 views 1 answer

asked Mar 20, 2018 by anonymous

A.C. series motor as compared to D.C. series motor has?

Last Answer : A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

135 views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. series motor is operated on A.C. supply, it will?

Last Answer : If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

91 views 1 answer

asked Mar 20, 2018 by anonymous

Photocell and solar cell difference?

Photocell and solar cell difference?
Last Answer : A photo cell is a light dependent resistor which decreases it resistance high intensity of light and is used to automatically control lights etc where as a solar cell solar or light energy into electrical energy.

201 views 2 answers

asked Sep 2, 2019 by anonymous

Explain with neat diagram the working of photo-voltaic cell.

Explain with neat diagram the working of photo-voltaic cell.
Last Answer : Diagram the working of photo-voltaic cell: Working:- Solar cell operates on principle of Photo-voltaic effect Solar cell works in following steps: The solar cell is composed ... . When you connect loads such as a light bulb, electric current flows between the two electrodes.

226 views 1 answer

asked Aug 3, 2019 by anonymous

Explain the characteristics of solar cell.

Explain the characteristics of solar cell.
Last Answer : Characteristics of solar cell : Explanation :- Solar cells produce direct current ( DC ) electricity and current times voltage equals power, so we can create solar cell I-V curves representing ... system so that it can operate as close to its optimal peak power point (MPP) as possible.

254 views 1 answer

asked Aug 2, 2019 by anonymous

State the principle of solar cell. What is necessity of series and parallel connection of solar cells.

State the principle of solar cell. What is necessity of series and parallel connection of solar cells.
Last Answer : Principle of solar cell:- Working:- Solar cell operates on principle of Photo-voltaic effect Solar cell works in following steps: The solar cell is composed of a P-type ... of Voltage & Current rating it is necessity of connecting series and parallel connection of solar cells.

111 views 1 answer

asked Sep 7, 2018 by anonymous

In fuel cell the __________ energy is converted into electrical energy.

In fuel cell the __________ energy is converted into electrical energy. (A) Mechanical (B) Chemical (C) Heat (D) Sound
Last Answer : In fuel cell the Chemical energy is converted into electrical energy.

180 views 1 answer

asked May 8, 2018 by anonymous

anonymous · Answer 1 · 2018-03-14T23:44:05+0000

The cell phone has a battery inside it which caries DC. So cell phone uses DC.

naigangliu6 · Answer 2 · 2018-08-25T21:57:03+0000

Answer :

DC of course.

answered Aug 25, 2018 by naigangliu6

Do cell phones use AC or DC current?

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