Electronics - Ohm's Law - Discussion
Discussion Forum : Ohm's Law - General Questions (Q.No. 2)
2.
If doubling the voltage across a resistor doubles the current through the resistor then
Discussion:
15 comments Page 1 of 2.
Gil said:
1 decade ago
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.
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:
1 decade ago
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.
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.
Jyothi h s said:
3 years ago
1. The resistance of a conductor is constant under constant temperature and pressure
2. The applied voltage is directly proportional to the current flowing through the conductor.
Hence the resistance value remains constant R = V/I.
2. The applied voltage is directly proportional to the current flowing through the conductor.
Hence the resistance value remains constant R = V/I.
(1)
Sarvesh goswami said:
1 decade ago
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
2v=2I*resister (R)
2V/2I =R
v/i= R
According to the Ohm's law the value or resister is remain same
Bajrang said:
1 decade ago
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.
Sundara pandian said:
1 decade ago
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).
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).
M.Daniyal Munir said:
1 decade ago
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.
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.
Eleczee said:
1 decade ago
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.
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.
C J said:
9 years ago
The resistance R is dependent neither on the voltage V nor on the current I. So R will remain constant.
Tayyaba said:
1 decade ago
Voltage and current are proportional to each other and are is a constant:.
V=IR.
(2V) = (2I)R.
V=IR.
V=IR.
(2V) = (2I)R.
V=IR.
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