Electrical Engineering - Voltage, Current and Resistance - Discussion

Discussion :: Voltage, Current and Resistance - General Questions (Q.No.3)

3. 

Current flows in a circuit when

[A]. a switch is opened
[B]. a switch is closed
[C]. the switch is either open or closed
[D]. there is no voltage

Answer: Option B

Explanation:

No answer description available for this question.

Sandhya said: (May 5, 2011)  
When circuit is open current does not flow, When switch is closed in any circuit it acts as a closed circuit so current flows only in a closed circuit.

Surajit said: (Apr 6, 2012)  
When circuit is closed current passing through the circuit. Without any voltage source no current flows through the circuit.

Rachit.Shah said: (Jun 23, 2012)  
When circuit is open current not flow, because its not have any path to flow;and when switch is closed the path is created that's why current flows.

Nagathesvaran said: (Oct 5, 2012)  
Current is always going close path only.

Rogers Prosper said: (Nov 29, 2012)  
When the switch is closed that's when the circuit is complete and current will flow through but when the switch is open the circuit is not complete so there will be no flow of current.

Ram said: (Mar 9, 2013)  
Yes, When circuit is closed current passing through the circuit. Without any voltage source no current flows through the circuit. Very good.

Basava said: (Jul 29, 2013)  
Switch opened current not flow so switched closed current easily flow.

M.P.Chari said: (Aug 3, 2013)  
Yes, this is the correct answer, because the electrons flows alternately in the circuit, when the switch is opened the electrons cannot flow in the circuit thats why the current doesn't flow in the circuit. When the switch is closed the electrons flows into the circuit then the circuit becomes on, thats why current flows in the circuit when the switch is closed.

Prince said: (Mar 3, 2014)  
When switch is closed then the circuit is complete and current flow.

Chandra Sekhar Parida said: (Apr 10, 2014)  
Switch open means without contact & close means with contact. So when switch close current flow easily.

Shivam Sharma said: (Apr 28, 2014)  
Yes, because open circuit not supply completely and disconnect component Or closed circuit easily flow of current, component are Ok.

Basavaiah said: (May 15, 2014)  
Current must be flow in short circuit or closed circuit only.

Krishna said: (Aug 21, 2014)  
To flow of current there should be closed circuit so switch should be closed.

Anil Kumar Shah said: (Aug 26, 2014)  
Current is always flow in a closed circuit only.

Ashutosh Jena said: (Feb 7, 2015)  
Current only flow on short circuit only it will be work on closed circuit.

Prakash Gayen said: (Feb 26, 2015)  
We know v=ir, if v=0 [as per question] then definitely i=0. i.e no current flow through circuit.

Secondly if we consider this is a circuit which is closed i.e. [] then current will flow.

But if we consider circuit is open i.e [ ] no current flow.

So option B will be answer.

Madhusmita said: (Aug 6, 2015)  
Switch is open means the circuit incomplete. Switch is close means the circuit complete and the current always flow in a close path/circuit.

So option B is the answer.

Shivam Sharma said: (Aug 18, 2015)  
When circuit is open then we can say the wire of system is cut at anywhere so there is no voltage transfer here so option B is correct answer.

Dcs said: (Oct 24, 2015)  
Open circuit - Voltage will occurred.

Close circuit - Current will occurred,

Sasanka said: (Mar 24, 2016)  
A switch is open means circuit not completed. So, current not flow the circuit. But, the switch is close means circuit complete. So, current flow easily the circuit. So answer option B.

Nisar Ahmad Ganai said: (Jun 19, 2016)  
Current always flows, when there is some closed system.

Krishna said: (Oct 27, 2017)  
Plesae give me the answer.

Manish Vishwakarma said: (Jan 26, 2019)  
Current flow always in a closed circuit.

For eg:

If you have two Wire and a lamp.
Then both wire first terminal you connect to the lamp and second terminal you connect only one wire. Then the lamp can't blow.

The reason is the circuit is not complete.
And again we connected both wires then lamp give light.

So the flow of current is important to close the circuit.

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