Electronics - Ohm's Law - Discussion

2. 

If doubling the voltage across a resistor doubles the current through the resistor then

[A]. the resistor value decreased
[B]. the resistor value did not change
[C]. the resistor value increased
[D]. it is impossible to determine the change in the resistor value

Answer: Option B

Explanation:

No answer description available for this question.

Eleczee said: (Oct 31, 2010)  
We know ohms law,V=IR
here V is changed to 2V
and so current changes from I to 2I
therefore,2V=2IR
which implies,V=IR
Hence remains the same.

Laksh said: (Nov 3, 2010)  
I is proportional to V

Sarvesh Goswami said: (Aug 21, 2011)  
In this question the voltage & current across the resister is double i.e.

2v=2I*resister (R)
2V/2I =R
v/i= R

According to the Ohm's law the value or resister is remain same

M.Daniyal Munir said: (Sep 22, 2011)  
We know ohms law,V=IR

Here V is changed to 2V
and so current changes from I to 2I

Therefore,2V=2IR
which implies,V=IR
Hence remains the same.

Naren Raja said: (Oct 5, 2011)  
Resistor value is fixed and it will not change.

Bajrang said: (Oct 10, 2011)  
On changing I proportional voltage, the current also change by same extent and we know that R is directly proportional to V and inversly proportional to I hence answer is B.

Vimala said: (Dec 14, 2011)  
Thanks eleczee.

Tayyaba said: (Jun 3, 2012)  
Voltage and current are proportional to each other and are is a constant:.
V=IR.
(2V) = (2I)R.
V=IR.

Gil said: (Jul 1, 2012)  
Pay attention to the words that is being used in the problem.
ACROSS means = parallel to the resistor.
And THROUGH means = series to the resistor.

Since,
Voltage at parallel is the same.
Current in series is the same.
We can say that Vb=2volts & Ib=2amperes in the Second Equation.

Therefore.
Using the ohms law : I = V/R.

Equation 1 : Ra = 1Va/1Ia is 1ohm.
Equation 2 : Rb = 2Vb/2Ib is 1ohm.


Conclusion.

Rb=Ra=1ohm therefore The value of the resistor remains the same and did not change.

Dileepkumar said: (Aug 25, 2012)  
Once fix the resistor if then the applied current&voltage is varied randomly ,the resistance not changed.
how ever ,
we know that ohm's law
V=IR;
GIVEN THAT V=2V;
I=2I;
WE SUBSTITUTE THE OHMS LAW IN ABOVE GIVEN EQATIONS
R=2V/2I
R=V/I,
SO THE RESISTANCE VALUE IS NOT CHANGED BY VARIENG THE CURRENT AND VOLTAGE.

Sundara Pandian said: (May 18, 2013)  
According to Ohms law,

V=IR and R=V/I.
If V doubles and it become 2V and I doubles and it become 2I.

Therefore R = 2V/2I = V/I (R values not change).

Nandhini.S said: (Apr 8, 2015)  
V=IR.

Does are value remain constant always?

C J said: (May 23, 2016)  
The resistance R is dependent neither on the voltage V nor on the current I. So R will remain constant.

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