Alternating current

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Related questions

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.

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. 

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.

Description : The frequency of an alternating current is?

Last Answer : The frequency of an alternating current is the number of waves passing through a point in one second.

Description : In the case of an unsymmetrical alternating current the average value must always be taken over?

Last Answer : In the case of an unsymmetrical alternating current the average value must always be taken over the whole cycle.

Last Answer : Alternating current is measured by induction ammeter.

Description : Can you make alternating current through a battery?

Last Answer : Yes, we can make AC through a battery using an inverter.

Description : Alternating voltages and phasors (Problem 15)

Last Answer : Alternating voltages and phasors (Problem 15)

Description : Alternating voltages and phasors (Problem 14)

Last Answer : Alternating voltages and phasors (Problem 14)

Description : Alternating voltages and phasors (Problem 13)

Last Answer : Alternating voltages and phasors (Problem 13)

Description : Alternating voltages and phasors (Problem 12)

Last Answer : Alternating voltages and phasors (Problem 12)

Description : Alternating voltages and phasors (Problem 11)

Last Answer : Alternating voltages and phasors (Problem 11)

Description : Alternating voltages and phasors (Problem 10)

Last Answer : Alternating voltages and phasors (Problem 10)

Description : Alternating voltages and phasors (Problem 9)

Last Answer : Alternating voltages and phasors (Problem 9)

Description : Alternating voltages and phasors (Problem 8)

Last Answer : Alternating voltages and phasors (Problem 8)

Description : Alternating voltages and phasors (Problem 7)

Last Answer : Alternating voltages and phasors (Problem 7)

Description : Alternating voltages and phasors (Problem 6)

Last Answer : Alternating voltages and phasors (Problem 6)

Description : Alternating voltages and phasors (Problem 5)

Last Answer : Alternating voltages and phasors (Problem 5)

Description : Alternating voltages and phasors (Problem 4)

Last Answer : Alternating voltages and phasors (Problem 4)

Description : Alternating voltages and phasors phasor addition and division (Problem 3)

Last Answer : Alternating voltages and phasors phasor addition and division (Problem 3)

Description : Alternating voltages and phasors : phasor addition (Problem 2)

Last Answer : Alternating voltages and phasors : phasor addition (Problem 2)

Description : Alternating voltages and phasors (Problem 1)

Last Answer : Alternating voltages and phasors (Problem 1)

Description : Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life. 

Last Answer : 1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series.  2) ...   4) Effect on Life:- If supply voltage is not stable then life of LED get reduced. 

Description : With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.

Last Answer : Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage. 

Description : Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Last Answer : Definition of parameters of OPAMP is follows:  i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.

Description : Current division rule example

Last Answer : Current division rule example

Description : A linear network has a current input 4cos(ω t + 20º)A and a voltage output 10 cos(ωt +110º) V. Determine the associated impedance.

Last Answer : Solution

Description : Find current through resistor using nodal analysis

Last Answer : Find current through resistor using nodal analysis

Description : Nodal analysis problem two current source

Last Answer : Nodal analysis problem two current source

Description : 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.

Description : Does current flow through a capacitor ?

Last Answer : Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

Description : What kills, current or voltage?

Last Answer : Current would kill. You can actually have thousands of bolts going through you and not even know it. Yes you probably know already voltage is current times resistance. Since your body is a resistor it would take just a small amount of current to create a very high voltage

Description : Electric Current

Last Answer : Electric current is the flow of charges. The electrons flow from higher density area of electrons to lowers density area of electrons. The terminal of battery which we called positive terminal of ... circuit is called electric current. The unit of electric current is Coulomb per Second or Ampere.

Description : Define current. State its unit.

Last Answer : Electric current: It is a measure of the amount of electrical charge transferred per unit time. It represents the flow of electrons through a conductive material, such as a metal wire. Unit: 1 coulomb/second. OR Its unit is ampere represented by A

Description : Give two applications of each : 1) Eddy current sensor 2) Optical sensor.

Last Answer : Eddy current sensor : 1. Detection of non-magnetic but conductive materials. 2. Displacement sensing 3. Position sensing Optical sensor : 1. Position Detection 2. Velocity Detection 3. Acceleration Detection 4. Direction Detection

Description : A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?

Last Answer : The current is 10.0A.  1ampere = 1 Coulomb per 1 second.  0.1Coulombs ÷ 0.01seconds = 10.0amperes.

Description : A) Watt B) Volts C) Farad D) Ampere

Last Answer : Correct answer: D) Ampere

Description : Current ratio

Last Answer : Current ratio

Description : Current divider rule

Last Answer : Current divider rule

Description : Current formula

Last Answer : Current formula

Description : Capacitive current

Last Answer : Capacitive current formula

Description : How to find total impedance Z, current I and Impedance angle ?

Last Answer : How to find total impedance Z, current I and Impedance angle ?

Description : Why inductor current lags inductor voltage ?

Last Answer : Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor

Description : Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

Last Answer : When two alternating quantities attain their respective zero or peak values simultaneously, the quantities are said to be in-phase quantities. When the quantities do not attain their respective zero or ... current is leading the voltage or the voltage is said to be lagging behind the current.

Description : List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Last Answer : Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

Description : State various effects of electric current and explain any one.

Last Answer : Effects of Electric Current:  1. Magnetic Effect: When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current carrying ... The rise in temperature is converted into elongation of hot wire element causes displacement of pointer. 

Description : Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.

Last Answer : 1) Voltage ratio: The voltages in primary and secondary winding is proportional to number of turns in primary and secondary respectively. So, the voltage ratio is same as transformation ratio. V2/V1 = N2 ... as transformation ratio of transformer. It is denoted by K. K = N2/N1

Description : Write the relation between phase and line current, phase and line voltage for Star connection.

Last Answer : Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection

Description : A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω  

Last Answer : A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω  

Description :  If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55  

Last Answer :  If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98