Electronics - Voltage and Current - Discussion

4. 

A voltage will influence current only if the circuit is:

[A]. open
[B]. insulated
[C]. high resistance
[D]. closed

Answer: Option D

Explanation:

No answer description available for this question.

Ruchi said: (Oct 19, 2010)  
If the circuit will closed, then only currrent will flow throughtout the circuit and by Ohm's law, V = IR.

Sundar said: (Oct 19, 2010)  
To flow the current the electron-hole pairs should be recombined that is done when only the circuit is closed.

Oksbwn said: (Oct 31, 2010)  
If circuit is not closed their will be no flow of electrons and hence no current.

Hilal said: (Dec 13, 2010)  
Electrons cannot reach the positive pole without completion circuit and hence no current flow.

Kavitha said: (Dec 22, 2010)  
General:

open circuit = no current flow.

Closed circuit = current flow.

It would be differ under logic gate condition.

Uma Maheswararao said: (Dec 31, 2010)  
Current flows in closed circuits only. At open terminals voltage is infinity that is maximum, where as current will be zero. In case short circuits, voltage is zero and current will be maximum.

So, voltage is inlfuence the current in closed circuits only.

Swapnil said: (Dec 31, 2010)  
From Ohm's law,
Current(I)=Voltage(V)/Resistance(R)

So, current is inversely proportional to resistance. Lower the resistence & the current will increase, if voltage is constant. This can happen only in case D.

Shankar said: (Jan 3, 2011)  
Electron and hole only recombine if circuit are closed, this condition important for flow current.

Vineeta Verma said: (Jan 6, 2011)  
Open ckt no current flow.

Closed ckt current will be flow.

Debdip said: (Jan 18, 2011)  
Open circuit = no current flow.

Closed circuit = current flow.

Mathivathani said: (Feb 14, 2011)  
Voltage is nothing but it is pressure. Pressure is only exist in closed circuit and so it influence electron and produce current.

Pawan Waghade said: (Apr 11, 2011)  
Open circuit=no flow current.

If voltage sourse is present & curcuit is open then current will not flow.

Ram said: (Apr 15, 2011)  
Current will flow through minimum resistance path only. In a open circuit n/w resistance offered is very high so current will be zero.

Imran said: (May 4, 2011)  
v=ir, in open ckt i=0, then v also 0,

Anurag said: (Jun 14, 2011)  
I agree with ruchi.

Rajesh said: (Jun 29, 2011)  
We know that current always flows through low resistance path. During the open-circuit condition the circuit has high resisance.

Digvijay Pandey said: (Aug 12, 2011)  
Open circuit has infinite resistance and we know that resistance is opposition to flow of current if opposition to current is infinite then current is zero so we have ohms law

(i.e) v/i=r if i=o then v=o.

So circuit must be closed.

Mib said: (Sep 9, 2011)  
Resistance is more if thre is an open path and current can't reach the desired destination so if it is cloesd then we can say the volt influence the current to move only if the circuit is closed.

Karthikeyan said: (Sep 19, 2011)  
To flow the current the electron-hole pairs should be recombined that is done when only the circuit is closed.

Rajesh said: (Dec 3, 2011)  
But what about in the transformers?

Rashmi said: (Dec 21, 2011)  
When circuit will be close, only in this condition electrons shall flow. Because for the current two poles must have (positive pole and negative pole.

Bharat said: (Dec 21, 2011)  
The current will be flowing only when the circuit is closed.

Nishanth said: (Jan 17, 2012)  
Hello friends I want the exact definition for voltage and current?

what is the difference between them?

Please anyone tell me?

Sreeyush Sudhakaran said: (Feb 18, 2012)  
Consider voltage as water in a tank and current as water flowing in pipe.

Force of water flowing in pipe(current) is related to amount of water in tank(voltage).

Water flow in pipe(current) depends on water in tank(voltage) only when pipe is connected to tank(closed cicuit).

when pipe breakes(open cicuit) water flow stopes at tap(current=0)

Ajaj Jamadar said: (Feb 22, 2012)  
Current will only flow when the circuit is CLOSED. While it doesn't flow when it is open. Remember one more thing that it is not obey in the digital logic.

Ambica said: (Feb 29, 2012)  
Sreeyush what a great example, you done nice job!

Krishan Kumar said: (Apr 18, 2012)  
Open circuit cannot flow current.

Gamju said: (Jun 6, 2012)  
As by ohm's law v is directly proportional to resistance. So during closed circuit current can be affected

Srinivas said: (Jun 20, 2012)  
The current will produce by flowing of electrons. This will happen only in closed circuit. So if the current flow then it will influence voltage.

Hinisha said: (Jul 14, 2012)  
It's very nice example of eater tank as a voltage and flow in a pipe is a current.

Pushpendra Rajpoot said: (Aug 3, 2012)  
Consider voltage as water in a tank and current as water flowing in pipe.

Force of water flowing in pipe(current) is related to amount of water in tank(voltage).

Water flow in pipe(current) depends on water in tank(voltage) only when pipe is connected to tank(closed cicuit).

when pipe breakes(open cicuit) water flow stopes at tap(current=0)

Anju said: (Dec 7, 2012)  
If open circuit = no current flow.

If insulated = current not effected.

If high resistance = it oppose the current.

If circuit is closed = it allows the current flow.

Shruthi said: (Feb 19, 2013)  
Current will flow only when the circuit is closed.

Vishwas Choudhary said: (Mar 2, 2013)  
In open circuit ohms law not applicable. Its is apply on close loop circuit or mesh.

Sandip said: (Apr 16, 2013)  
As per ohms low, V==IR, current flow in the Closed circuit, when circuit is open their is no any current to flow.

Priyanka said: (Aug 5, 2013)  
As per ohms law voltage is directly proportional to current, there is no current in open circuit hence there is no effect of voltage in open circuit. There is effect of voltage in closed because current exists in closed circuit.

Kaviarasu said: (Sep 26, 2013)  
The current is due to the potential difference at the two points of the closed circuit.

Shaik. Waseem said: (Oct 13, 2013)  
According to ohms law V=IR, V is directly proportional to I, and R is proportionality constant, here it means voltage influence current. This whole process is occurred when only the circuit is closed (according to ohms law).

Umesh said: (Nov 10, 2013)  
Current flows only when circuit is closed.

Abhay Tiwari said: (Nov 14, 2013)  
See. You cannot have a current flow in open air.

That's why the birds don't get shocks while touching only one wire.

Instead if the bird is a BAT and touches two wire due to which the current gets one more path to travel except itself i.e. through the BAT's body. And poor bat dies. !

Same phenomenon is applied here. If a circuit is open then current cannot flow through it as the flow of electrons will not get any path for their conduction. Until and unless it is connected with a wire or some other conducting material connected with the opposite terminal of the battery.

Saswat said: (Nov 29, 2013)  
From Ohm's law,

Current(I) = Voltage(V)/Resistance(R).

Current flows only when circuit is closed.

Kalai said: (Dec 13, 2013)  
When the circuit is open, there is no path for flow of current. If the circuit is in short condition then there is o voltage. Voltage and current both are present when a circuit is in closed condition. So closed condition is the right answer.

Sherif Vettom said: (Dec 23, 2013)  
Current is flow of electrons and its direction is against current. Electrons flow only in closed circuits so current only will be in closed circuits.

Saurabh Pati said: (Feb 2, 2014)  
An open circuit leads to zero current whatever be the voltage so not A,

An insulated circuit will lead to a flow of negligible current however large the voltage be, so not B,

A high change in voltage is required to influence a small current in high resistance, so C is not viable.

Thus the closed circuit in which current flows on providing a potential difference and has no restrictions of insulation or high resistance is the most viable option.

George said: (Feb 6, 2014)  
Electrons only flow in an instance where there is continuity, therefore in a closed circuit, there is flow of electrons.

Hari said: (Mar 22, 2014)  
The electrons flow in open circuit zero(no current) the electrons flow closed path is necessary.

Joe said: (Apr 29, 2014)  
When circuit well closed that time only current well flow in open circuit current does not flow?

Priyanka said: (Jun 7, 2014)  
The amount of potential energy between two points on a circuit. One point has more charge than another. This difference in charge between the two points is called voltage. Current:The flow of the river.

Priya said: (Jun 19, 2014)  
If the circuit is open no current flow so current flow occur only in closed circuit.

Pratik Rajput said: (Jun 28, 2014)  
Electrons only flow in an instance where there is continuity, therefore in a closed circuit, there is flow of electron.

Sagar Pawar said: (Nov 5, 2014)  
Then it is no closed circuit then current is equal to zero.

Shilpa said: (Feb 19, 2015)  
This is because, only when the circuit is closed the voltage (V) is present which means the circuit is not short circuited.

If voltage (V) is present obviously current (I) will exist by the OHM'S LAW.

i.e V = IR.

Naveen said: (Mar 6, 2015)  
Circuit is closed then current passed. Circuit is open then no current passed.

Milad Ahmadi said: (Mar 7, 2015)  
If we have not a close circuit we have not I and V.

Raghuvaran said: (Mar 15, 2015)  
Circuit is closed the current is passing through each branch and voltage drop in the each branch.

If circuit is open no current flowing through the branch therefor their is no voltage drop.

Rovin said: (Mar 18, 2015)  
By ohms law current is flow only closed path.

Manoj Upreti said: (Apr 17, 2015)  
In an open circuit flow of current is not possible to shorting the current or measuring the current a shunt (provide the current for further circuit) is used between positive and negative terminal.

Moeen Khan said: (Jun 6, 2015)  
In case flow of current (It mean flow of electron and hole in a circuit, electron and hole are cancel each other and also current flowing will stop like (P-N junction depletion layer) then how flow current in a circuit?

Moeen Khan said: (Jun 6, 2015)  
The flow of electrons is called current then where are the proton?

Moeen Khan said: (Jun 6, 2015)  
The flow of electrons is called current then where are the proton?

Rashmi said: (Jun 22, 2015)  
If there is no voltage were will current flow through I mean charges flow through.

Priyanka Masi said: (Jul 31, 2015)  
Because of ohm's law voltage equal to current and resistance that's why current is maximum that time circuit is closed.

Rakesh &Amp; Smruti said: (Sep 12, 2015)  
According to ohms law.

V = IR.

Where V = Voltage.

I = Current.

R = Resistance.

We know current is directly proportional to voltage and inversely proportional to resistance.

Aqibkhattak said: (Dec 6, 2015)  
Circuit is closed the current is passing through each branch and voltage drop in the each branch.

If circuit is open no current flowing through the branch therefore there is no voltage drop.

Anirudh said: (Mar 6, 2016)  
A voltage is a force that forces charge, and moving charge is current and for movement of charge there should be a closed path.

Shubham said: (Jul 14, 2016)  
If the circuit will closed, then and then only current will flow through the circuit and by Ohm's law, V = IR.

Shatakshi said: (Jun 6, 2017)  
@Moeen.

The flow of electrons is called current. The protons are inside the nucleus so they do not flow. They are immobile. The positive charge that is said to flow are holes which represent the empty spaces left by electrons. So they flow in the direction opposite to the flow of electrons. Since current also flows opposite to the flow of electrons, the direction of flow of protons is equal to the direction of flow of current.

Sumit Ghagarmale said: (Aug 5, 2017)  
In case of short circuit how current will flow in the circuit?

Jeevan said: (Nov 11, 2017)  
That means current increase, voltage increase and current decrease resistance decrease please Clear answer.

Jadav said: (Apr 24, 2019)  
The current flow when the circuit is a close loop, see the path of -ve path to +ve of applied potential.

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