# What is the direction of an AC current?

2.6k views
What is the direction of an AC current?

It  flows  both  foward  direction  and  backward  direction  at  a  given  frequecy.

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.

## Related questions

93 views

Description : 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  .

157 views

Description : The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

Last Answer : The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching

181 views

Description : What happens when you reverse the direction of the current in an electromagnet?

Last Answer : When  you  reverse  current  direction  in  an  electromagnet,  the magnetic  poles  will  also  change.

81 views

Description : What is the direction of the induced current?

97 views

Description : What is the direction of flow of current?

Last Answer : Current  flows  from  anode  to  cathode(opposite  direction  to  flow of  electrons)

102 views

Description : What is the direction of the conventional current flow?

Last Answer : The conventional current flow in opposite direction of flow of electrons. The electrons flow from negative terminal of battery to positive terminal of battery. And conventional current flow from positive terminal of battery to negative terminal of battery.

173 views

Description : What is the direction of flow of electric current in an electric circuit?

Last Answer : It  flows  from  anode  to  cathode  (direction  of   holes  flow)

116 views

Description : why current flows in opposite direction of electrons?

Last Answer : Hi team, the current flow is nothing but flow of electrons But the conventional direction I'd opposite to actual current flow . ..

185 views

Description : 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.

210 views

Description : Do cell phones use AC or DC current?

Last Answer : DC of course.

137 views

Description : Is current from a battery AC or DC?

Last Answer : The current from the battery is DC

197 views

Description : Why do we use AC current in our homes?

Last Answer : We used it for cooking rice,  For washing clothes and for lights in the house.

5.3k views

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.

864 views

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

139 views

Description : In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

Last Answer : In a single-phase induction motor, the operating direction is determined by the Starting circuit

80 views

Description : What is the direction of the induced electric field?

Last Answer : It  is  in  opposite  direction   to  the  one  that   produced  it.

129 views

Description : What is the direction of the electric field?

Last Answer : Electric   field    is  at   right angle   widh  flow  of  current  (right  hand   rule).

110 views

Description : What is the direction of the flow of electrons?

Last Answer : Electrons  flow    cathode   to   anode  or  in   an  oposite  direction  of   convection  current  flow  or  holes.

74 views

Last Answer : Yes DIAC can conduct in both direction.

265 views

Last Answer : The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.

618 views

Description : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

Last Answer : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator

595 views

Description : Two non-collinear parallel equal forces acting in opposite direction?

Last Answer : Two non-collinear parallel equal forces acting in opposite direction constitute a couple.

190 views

Last Answer : The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

354 views

Last Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.

370 views

Last Answer : Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.

235 views

Last Answer : The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.

122 views

Last Answer : In repulsion motor direction of rotation of motor is the same as that of brush shift.

310 views

Description : How can we reverse the direction of rotation of synchronous motor?

Last Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.

74 views

Description : What is the direction of flow when charging a capacitor?

2 views

Description : Will the Dow Jones Iindustrial Average rise or fall on Moday the 2nd of August.

Last Answer : I can, with the utmost confidence, assert with 50% certainty that it will go up on 8/2/10.

1 view

Description : How do you give your personal answer on this site?

Last Answer : I suggest starting a blog on blogspot. You might get a friend to help you with it. I’m guessing by the state of your writing-abilities you are not great with computers, but I’ll bet that you are an awesome artist! Good luck!

83 views

Description : What is the advantage of AC over DC electrical transmission?

164 views

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.

100 views

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.

152 views

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

212 views

Description : Why is AC better for long distance power transmission than DC ?

Last Answer : ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.

118 views

Description : Why can't we store AC in batteries instead of DC ?

Last Answer : Because the direction of the current changes in AC electricity, you cannot directly store the power. Placing a capacitor in an AC circuit has no effect on the alternating flow of the electricity. The only ... is indirectly, by storing DC and then using a power inverter to convert the DC to AC.

105 views

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

2.4k views

Description : AC generator

Last Answer : A.C power can be generated as a single phase or as a balanced poly-phase system. However, it was found that 3-phase power generation at 50 Hz will be economical and most suitable. Present day three phase generators ... has uniform air gap (figure 2.1(b)) and used when speed is high.

422 views

Description : Define : i) Average value ii) RMS value of an AC Wave.

Last Answer : i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.

5.2k views

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.

107 views

Description : AC Circuits with Resistance but No Reactance

Last Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.

181 views

Description : What is the need of polarity marking in polyphase AC circuits?

Last Answer : Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.

1.5k views

Description : Explain how sinusoidal AC voltage is generated by using simple one loop generator.

Last Answer : An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform.

398 views

Description : ‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

Last Answer : The direction of force exerted on moving coil depends on the direction of current flowing through moving coil. If the direction of magnetic field is kept constant, it produces unidirectional torque if the current is ... on the coil in one cycle to zero. Hence the meter cannot read A.C. quantities.

120 views

Description : Write short notes on 3 phase AC system.

471 views

Description : 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.

146 views

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 .

113 views

Description : The ac bypassing of RF by CF in a common emitter configuration :  (A) increases ac signal across emitter -base junction (B) decreases ac signal across emitter -base junction (C) decreases voltage amplification (D) stabilizes the Q -point

Last Answer : The ac bypassing of RF by CF in a common emitter configuration : increases ac signal across emitter -base junction