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"Loneliness is the most terrible poverty."
- Mother Teresa
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

Explanation:

No answer description available for this question.


Eleczee said: (Sun, Oct 31, 2010 02:31:09 AM)    
 
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: (Wed, Nov 3, 2010 12:48:54 PM)    
 
I is proportional to V

Sarvesh Goswami said: (Sun, Aug 21, 2011 04:55:45 PM)    
 
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: (Thu, Sep 22, 2011 06:46:27 PM)    
 
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: (Wed, Oct 5, 2011 11:16:53 AM)    
 
Resistor value is fixed and it will not change.

Bajrang said: (Mon, Oct 10, 2011 11:33:23 PM)    
 
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: (Wed, Dec 14, 2011 10:32:34 PM)    
 
Thanks eleczee.

Tayyaba said: (Sun, Jun 3, 2012 03:22:09 PM)    
 
Voltage and current are proportional to each other and are is a constant:.
V=IR.
(2V) = (2I)R.
V=IR.

Gil said: (Sun, Jul 1, 2012 11:24:19 AM)    
 
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: (Sat, Aug 25, 2012 05:41:44 PM)    
 
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: (Sat, May 18, 2013 01:41:41 PM)    
 
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).

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