What is alternating current?

What is alternating current?
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1 Answer

Answer :

Bi-directional flow of current in a sinusoidal form with a positive and negative peak.
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Related questions

Alternating current generator converts.......... energy into electrical energy? a. mechanical energy b. chemical energy c. solar energy d. potential energy

Description : Alternating current generator converts.......... energy into electrical energy? a. mechanical energy b. chemical energy c. solar energy d. potential energy

Last Answer : a. mechanical energy

The Principle of an alternating current generator is based on: a. Coulomb’s law b. Ampere’s law c. Faraday’s law d. Lenz’s law

Description : The Principle of an alternating current generator is based on: a. Coulomb’s law b. Ampere’s law c. Faraday’s law d. Lenz’s law

Last Answer : a. Coulomb’s law

Alternating current (AC)

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.

When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

Description : When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

Last Answer : When an alternating current passes through an ohmic resistance the electrical power converted into heat is true power.

5) An iron ring of mean circumference of 80 cm is uniformly wound with 500 turns of wire. Calculate the value of flux density that a current of 1 A would produce in the ring. Assume relative permeability 1400.

Description : Please ripley me due to emergency

Last Answer : To calculate the flux density in the ring, you need to use the following formula: B = (μ * I * N) / (2 * π * r) where: B is the flux density in the ring (in teslas) μ is the relative permeability ... 2 * π * 0.127 m) = 0.53 T So the flux density in the ring would be approximately 0.53 teslas.

In a thyristor Latching current is ________ than Holding current a) Equal b) Less c) Greater d) None

Description : In a thyristor Latching current is ________ than Holding current a) Equal b) Less c) Greater d) None

Last Answer : Ans: Greater

The force between two long parallel conductors is inversely proportional to (a) radius of conductors (b) current in one conductor (c) product of current in two conductors (d) distance between the conductors

Description : The force between two long parallel conductors is inversely proportional to (a) radius of conductors (b) current in one conductor (c) product of current in two conductors (d) distance between the conductors

Last Answer : (d) distance between the conductors

A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be (a) zero (b) BLI (c) B2LI (d) BLI2

Description : A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be (a) zero (b) BLI (c) B2LI (d) BLI2

Last Answer : (a) zero

The left hand rule correlates to (a) current, induced e.m.f. and direction of force on a conductor (b) magnetic field, electric field and direction of force on a conductor (c) self induction, mutual induction and direction of force on a conductor (d) current, magnetic field and direction of force on a conductor

Description : The left hand rule correlates to (a) current, induced e.m.f. and direction of force on a conductor (b) magnetic field, electric field and direction of force on a conductor (c) self induction, ... and direction of force on a conductor (d) current, magnetic field and direction of force on a conductor

Last Answer : (d) current, magnetic field and direction of force on a conductor

Fleming's left hand rule is used to find (a) direction of magnetic field due to current carrying conductor (b) direction of flux in a solenoid (c) direction of force on a current carrying conductor in a magnetic field (d) polarity of a magnetic pole

Description : Fleming's left hand rule is used to find (a) direction of magnetic field due to current carrying conductor (b) direction of flux in a solenoid (c) direction of force on a current carrying conductor in a magnetic field (d) polarity of a magnetic pole

Last Answer : (c) direction of force on a current carrying conductor in a magnetic field

The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is (a) proportional to 7 (b) proportional to X (c) proportional to distance between the conductors (d) inversely proportional to I

Description : The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is (a) proportional to 7 (b) proportional to X (c) proportional to distance between the conductors (d) inversely proportional to I

Last Answer : (b) proportional to X

The termresponsivityasit appliesto a light detectorisbest described as a. the time required for the signal to go from 10 to 90 percent of maximum amplitude b.the ratio ofthediode output currentto opticalinputpower c. the ratio of output current to output power d. the ratio of output current to input current

Description : The termresponsivityasit appliesto a light detectorisbest described as a. the time required for the signal to go from 10 to 90 percent of maximum amplitude b.the ratio ofthediode output currentto ... of output current to output power d. the ratio of output current to input current

Last Answer : b.the ratio ofthediode output currentto opticalinputpower

What is a current transformer and voltage transformer?*

Description : What is a current transformer and voltage transformer?*

Last Answer : In electrical engineering, a current transformer (CT) is used for measurement of electric currents. Current transformers, together with voltage transformers (VT) (potential transformers (PT)), ... transformers are commonly used in metering and protective relays in the electrical power industry.

Current carried by each of the two long parallel conductors is doubled. If their separation is also doubled , force between them is

Description : Current carried by each of the two long parallel conductors is doubled. If their separation is also doubled , force between them is

Last Answer : Increase two fold

How do you test reverse power trip, high current trip, preferential trip?

Description : How do you test reverse power trip, high current trip, preferential trip?

Last Answer : Reverse power trip - refer answer for question 11. Also ask E/O. High current (over load trip) - Set your overload relay high current trip setting to say 75% of the rated current. Run the ... loads to overload the generator. Preferential trip will trip all the non-critical loads. Also ask E/O.

Does current flow though a capacitor?

Description : Does current flow though a capacitor?

Last Answer : No. Current (or more specifically, charge) flows into one plate, and an opposing current (charge) flows out of the other plate, but the current (except for leakage current) does not flow across the dielectric. The result is that there is a charge differential between the plates.

Why is this reverse power used instead of reverse current in alternators?

Description : Why is this reverse power used instead of reverse current in alternators?

Last Answer : It is extremely difficult to detect reverse current with an alternating current system, reverse power can be detected and protection can be provided by reverse power relay.

Does current flow through hull during welding?

Description : Does current flow through hull during welding?

Last Answer : Ask E/O. Yes I think

How does current flow during welding?

Description : How does current flow during welding?

Last Answer : The current flows through the electrode and to the clamp. That's how it flows in MIG, stick, flux cored. On Tig, the electricity flows through the electrode also except that now that's the only function of it, the rod is held in your hand and electrode in the other.

What does three-phase current mean?

Description : What does three-phase current mean?

Last Answer : Three current sinusoidal waveforms equal in magnitude but with a phase shift of 120 degrees. 25

What is Direct Current?

Description : What is Direct Current?

Last Answer : Uni-directional flow of current.

Under ideal conditions, the collector current is (a) Equal to base current (b) Nearly equal to emitter current (c) Less than base current (d) always zero

Description : Under ideal conditions, the collector current is (a) Equal to base current (b) Nearly equal to emitter current (c) Less than base current (d) always zero

Last Answer : (b) Nearly equal to emitter current

The output from a full wave rectifier is (a) A pulsating uni-directional current (b) A DC voltage (c) Zero (d) An AC voltage

Description : The output from a full wave rectifier is (a) A pulsating uni-directional current (b) A DC voltage (c) Zero (d) An AC voltage

Last Answer : a) A pulsating uni-directional current

In the reverse biased p-n junction, the current is of the order of (a) Ampere (b) Milliampere (c) Microampere (d) Nano-ampere

Description : In the reverse biased p-n junction, the current is of the order of (a) Ampere (b) Milliampere (c) Microampere (d) Nano-ampere

Last Answer : (d) Nano-ampere

On increasing the reverse bias to a large value in a p-n junction diode current (a) Increases slowly (b) Remains fixed (c) Suddenly increases (d) Decreases slowly

Description : On increasing the reverse bias to a large value in a p-n junction diode current (a) Increases slowly (b) Remains fixed (c) Suddenly increases (d) Decreases slowly

Last Answer : (c) Suddenly increases

In a transistor, the conventional current flows from base to emitter. The transistor is (a) NPN (b) PNP (c) FET (d) None of these

Description : In a transistor, the conventional current flows from base to emitter. The transistor is (a) NPN (b) PNP (c) FET (d) None of these

Last Answer : (a) NPN

Silicon transistors are preferred because: (a) High operating temperature (b) Low leakage current (c) Suited to high frequency circuits (d) All

Description : Silicon transistors are preferred because: (a) High operating temperature (b) Low leakage current (c) Suited to high frequency circuits (d) All

Last Answer : (d) All

Current gain of a transistor which has collector current of 10 mA and a base current of 40 micro Ampere is: (a) 25 (b) 250 (c) 2500 (d) 25000

Description : Current gain of a transistor which has collector current of 10 mA and a base current of 40 micro Ampere is: (a) 25 (b) 250 (c) 2500 (d) 25000

Last Answer : b) 250

A photodiode can switch its current ON or OFF in (a) nano second (b) milli second (c) micro second (d) centi second

Description : A photodiode can switch its current ON or OFF in (a) nano second (b) milli second (c) micro second (d) centi second

Last Answer : (a) nano second

The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes

Description : The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes

Last Answer : (a) Minority carrier

Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons

Description : Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons

Last Answer : (b) majority carriers

In p-n-p transistor, collector current is (a) Equal to emitter current (b) slightly less than emitter current (c) greater than emitter current (d) any of above

Description : In p-n-p transistor, collector current is (a) Equal to emitter current (b) slightly less than emitter current (c) greater than emitter current (d) any of above

Last Answer : (c) greater than emitter current

The induced current can be increased by: a. Using strong magnetic field b. moving loop faster c. Replacing loop by coil d. all of above

Description : The induced current can be increased by: a. Using strong magnetic field b. moving loop faster c. Replacing loop by coil d. all of above

Last Answer : d. all of above

The induced current in transformer which produced in the direction perpendicular to flux, is known as: a. Conventional current b. electronic current c. Perpendicular current d. Eddy current

Description : The induced current in transformer which produced in the direction perpendicular to flux, is known as: a. Conventional current b. electronic current c. Perpendicular current d. Eddy current

Last Answer : c. Perpendicular current

Electric current produces magnetic field was suggested by: a. Faraday b. Lenz c. Ohm d. Oerested

Description : Electric current produces magnetic field was suggested by: a. Faraday b. Lenz c. Ohm d. Oerested

Last Answer : c. Ohm

“The direction of induced current is always so as to oppose the change which causes the Current” is the statement of: a. Faraday’s law b. Lenz’s Law c. Ohm’s Law d. Kirchoff’s rule.

Description : “The direction of induced current is always so as to oppose the change which causes the Current” is the statement of: a. Faraday’s law b. Lenz’s Law c. Ohm’s Law d. Kirchoff’s rule.

Last Answer : c. Ohm’s Law

The phenomenon of producing emf in the coil due to change of current in the coil itself is called: a. mutual induction b. self-induction c. self-inductance d. mutual inductance

Description : The phenomenon of producing emf in the coil due to change of current in the coil itself is called: a. mutual induction b. self-induction c. self-inductance d. mutual inductance

Last Answer : d. mutual inductance

The current flowing in a coil due to induced emf depends upon: a. shape of coil b. resistance of coil c. area of coil d. magnetic flux

Description : The current flowing in a coil due to induced emf depends upon: a. shape of coil b. resistance of coil c. area of coil d. magnetic flux

Last Answer : a. shape of coil

The current I passing through the galvanometer coil is related to the angle of deflection θ as a) I ∝ θ b) I 1/∝ θ c) I ∝ θ 2 d) I 1/∝ θ 2

Description : The current I passing through the galvanometer coil is related to the angle of deflection θ as a) I ∝ θ b) I 1/∝ θ c) I ∝ θ 2 d) I 1/∝ θ 2

Last Answer : a) I ∝ θ

When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B

Description : When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B

Last Answer : d) becomes perpendicular to B

A current of 5.8 A flows through a 0.25 m long straight conductor which is kept perpendicular in a region of uniform magnetic field of 3.7 T . The force on conductor is a) 5.4 N b) 2.4 N c) 3.4 N d) 6.4 N

Description : A current of 5.8 A flows through a 0.25 m long straight conductor which is kept perpendicular in a region of uniform magnetic field of 3.7 T . The force on conductor is a) 5.4 N b) 2.4 N c) 3.4 N d) 6.4 N

Last Answer : a) 5.4 N

A galvanometer has resistance of 120 Ω. In order to pass 5% of the main current in it, the value of shunt resistance Rs must be equal to a) 6.3 Ω b) 6 Ω c) 2 Ω d) 2.3 Ω

Description : A galvanometer has resistance of 120 Ω. In order to pass 5% of the main current in it, the value of shunt resistance Rs must be equal to a) 6.3 Ω b) 6 Ω c) 2 Ω d) 2.3 Ω

Last Answer : a) 6.3 Ω

A galvanometer of 65 Ω resistance gives full scale deflection with 4 mA current. In order to convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be a) 0.1 Ω b) 0.2 Ω c) 0.06 Ω d) 0.03 Ω

Description : A galvanometer of 65 Ω resistance gives full scale deflection with 4 mA current. In order to convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be a) 0.1 Ω b) 0.2 Ω c) 0.06 Ω d) 0.03 Ω

Last Answer : d) 0.03 Ω

A multipurpose instrument for measuring current, potential difference and resistance is a) Ohmmeter b) Astatic galvanometer c) Rheostat d) AVO Meter

Description : A multipurpose instrument for measuring current, potential difference and resistance is a) Ohmmeter b) Astatic galvanometer c) Rheostat d) AVO Meter

Last Answer : d) AVO Meter

___________ is not affected by a magnetic field a) Change in magnetic flux b) a moving electron c) a stationary proton d) current flowing in a conductor

Description : ___________ is not affected by a magnetic field a) Change in magnetic flux b) a moving electron c) a stationary proton d) current flowing in a conductor

Last Answer : c) a stationary proton

The conventional current is due to the flow of a. atoms and molecules b. positive charges c. negative charges d. both b and c

Description : The conventional current is due to the flow of a. atoms and molecules b. positive charges c. negative charges d. both b and c

Last Answer : b. positive charges

A fuse is placed in series with the cireuit to protect against a. high power b. high voltage c. high current d. over heating

Description : A fuse is placed in series with the cireuit to protect against a. high power b. high voltage c. high current d. over heating

Last Answer : d. over heating

All electrical appliances are connected in parallel to each other between the main line and neutral wire to get a. same current b. same current and potential difference c. different current but same potential difference d. different current and potential differences

Description : All electrical appliances are connected in parallel to each other between the main line and neutral wire to get a. same current b. same current and potential difference c. different current but same potential difference d. different current and potential differences

Last Answer : c. different current but same potential difference

Why should a resistance be introduced in a circuit in series deliberately? a. to increase current b. to decrease current c. to control current d. just to give a good look to circuit

Description : Why should a resistance be introduced in a circuit in series deliberately? a. to increase current b. to decrease current c. to control current d. just to give a good look to circuit

Last Answer : b. to decrease current

If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be a. 3600C b. 7200C c. 1C d. 2C

Description : If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be a. 3600C b. 7200C c. 1C d. 2C

Last Answer : a. 3600C