Electronics - Ohm's Law - Discussion

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.

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.

I is proportional to V

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

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.

Resistor value is fixed and it will not change.

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.

Thanks eleczee.

Voltage and current are proportional to each other and are is a constant:.
V=IR.
(2V) = (2I)R.
V=IR.

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.