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Description : Explain why potential difference is necessary to produce current in a circuit.

Description : In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Answer : In a series R-C circuit, with the increase in frequency, current Increases

Description : Magnitude of current at resonance in R-L-C circuit?

Answer : The current will be maximum if it is a series rlc circuit.

Description :

In a loss-free R-L-C circuit the transient current is?

Answer : In a loss-free R-L-C circuit the transient current is sinusoidal.

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

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

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

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

Description :

How eddy current is produced in a transformer?

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

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

Description :

How eddy current can be minimized?

Description : How does AC current change direction?

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

Description : How can we increase the induced current?

Answer : Induced  current  can  be  increased by  reducing  no  of   windings  on  the  secondary  part   compared   to   primary.

Description : In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

Answer : In parallel RLC resonance circuit at resonance the current will be Minimum 

Description : In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

Answer : In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency

Description : In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Answer : In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

Description :

In which fault the maximum short circuit current occurs?

Answer : In three phase bolted fault the maximum short circuit occurs.

Description : If the % reactance upto the fault point is 20%, then the short circuit current will be

Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current

Description : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

Description :

When one leg of parallel circuit is opened out the total current will?

Answer : When one leg of parallel circuit is opened out the total current will decrease.

Description :

Electric current passing through the circuit produces?

Answer : Electric current passing through the circuit produces thermal effect.

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?

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.

Description : How can a magnetic field be used to generate an electric current?

Answer : Magnetic  field  can  be  used  to  generate  electric  current  on  a  condition  that  it  is  on  a  rate  of  changing  magnetic  flux.  (Faraday's  law)

Description :

The amount of current flowing through a circuit with a 40 V source and 6.8  of resistance is equal to: A. 27.2 mA B. 59 mA C. 5.9 mA D. 590 mA

Answer : The amount of current flowing through a circuit with a 40 V source and 6.8 kΩ of resistance is equal to:  5.9 mA

Description : Consider a circuit with four 10 Ω resistors connected in parallel and the current flowing through the circuit is 5 A. What will be the current if the above 4 resistors are connected in parallel? A) 5 A B) 50 A C) 500 A D) None of these

Answer : Consider a circuit with four 10 Ω resistors connected in parallel and the current flowing through the circuit is 5 A. What will be the current if the above 4 resistors are connected in parallel? A) 5 A B) 50 A C) 500 A D) None of these

Description : The current flow in a battery is due to ______ A) movement of ions B) movement of protons C) movement of holes D) movement of neutrons

Answer : The current flow in a battery is due to movement of ions

Description : A current controlled voltage source is equivalent to :  (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier

Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier

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

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

Description : What happens to the resistance when the current increases?

Answer : Resistance  reduces  when  current  increases.

Description : Electrical shock happens for voltage/current?

Answer : The severity ofelectric shockdepends on thecurrentflowing through the body, which is a function of the electromotive force (E) involts, and the contact resistance (R) in ohms.

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

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 : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Answer : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Description :

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

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

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

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

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

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

Description : A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current decreases.

Answer : The question seems to be wrong. Increase in frequency would actually decrease the current through the Inductor. This happens because inductive reactance Xl is directly proportional to frequency. And if frequency increases the value of Xl would ... vice versa. Xl= 2*pi*f*L I=E/Z Z=sqrt(R^2+Xl^2)

Description : why current flows in opposite direction of electrons?

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

Description :

Direct Current (DC)

Next Topic : Alternating current (AC)

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 :

Alternating current (AC)

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 : Does current flow through a capacitor ?

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?

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 : Describe the difference between direct and alternating current.

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 :

Kirchhoff's Current Law

Answer : Kirchhoff's current law

Description : Current ratio

Answer : Current ratio

Description : Current divider rule

Answer : Current divider rule

Description : Current formula

Answer : Current formula

Description : Capacitive current

Answer : Capacitive current formula

Description : Why inductor current lags inductor voltage ?

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

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

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 : A 1000Ohm, 1 Watt resistor can safely pass a current of

Answer : A 1000 Ohm, 1 Watt resistor can safely pass a current of 30 mA

Description : Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current

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