Question

why does temperature remain constant in ohm law

Answer 1

The resistance of a conductor remains constant when there is no temperature change. The variation of resistance with temperature is given  by,

R = Rref[1+α(T - Tref)]

Where, R is the resistance of the conductor at temperature T.

Rref is the resistance of the conductor at the reference temperature Tref.
α is the temperature coefficient for resistance for the conductor material.

Ohm’ Law states: I = V/R

While verifying the Ohm’ law we observe the current through a conductor for different potential differences and the resistance of the conductor R is the constant of proportionality. When the temperature of the conductor is changed, the resistance will also change according to the equation given above. In such a case, the VI graph obtained will not be linear. So, the temperature is kept constant while verifying and also while applying the Ohm’ Law.

Answer 2

Answer:

Ohm's law of electric current is named after the scientist "Ohm". The most basic elements of modern electricity are voltage, current, and resistance. Ohm's law exhibit a simple relationship between these three quantities.

              Ohm's law of current states that if the physical conditions and temperature of the conductor are constant, the current through the conductor is directly proportional to the potential difference across it.

• where V = voltage, I = current, R = resistance.

• The SI unit for resistance is the ohm, expressed in Ω.

• To establish the relationship between current and voltage, the plot between the potential difference (V) and current (I) should be a straight line since the V/I ratio is constant for a given resistance.

• This law helps determine the voltage, current, impedance, or resistance of a linear circuit when the other two quantities are known. It also simplifies power calculations.

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