# Define current

define current

current is the flow of Electrical charge.
current = charge/time
Electrical current is a measure of the amount of electrical charge transferred per unit of time. It represents the flow of electrons through a conductive material. It is measured in amperes.

## Related questions

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

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 : Define current. State its unit.

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

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

Description : Kirchhoff's Current Law

Description : Current ratio

Description : Current divider rule

Description : Current formula

Description : Capacitive current

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 : 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 : 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 : 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 : 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 : 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

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 : For a round wire, the approximate value of fusing current is given by

Answer : For a round wire, the approximate value of fusing current is given by  K√d3

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 : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

Answer : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

Description : A network that consists of at least a voltage source or current source is called A) Active network B) Ideal network C) Sourced network D) Outsourced network

Answer : A network that consists of at least a voltage source or current source is called Active network

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 ferrite core has less eddy current loss than an iron core because?

Answer : A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

Description : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.

Answer : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is 20 Vs

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

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

Description : The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?

Description : The frequency of an alternating current is?

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

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 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 : 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 : Inductance affects the direct current flow?

Answer : Inductance affects the direct current flow at the time of turning on and off.

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 : Why does induction motor have high starting current?

Answer : In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor

Description : What is the relationship between power and current?

Answer : P = I2R Where P = power I = Current R = Resistance This the relationship between current and power.

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

Answer : Resistance  reduces  when  current  increases.

Description : How eddy current can be minimized?

Description : What is the difference between eddy current and hysteresis loss?

Answer : Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

Description : How eddy current is produced in a transformer?

Description : Do cell phones use AC or DC current?

Description : Can you make alternating current through a battery?

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

Description : What happens when a current flows through a wire?

Answer : Current can produce two effect one is heating effect and second is magnetic effect.

Description : Is current from a battery AC or DC?

Answer : The current from the battery is DC

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  .

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