why we take resistance as a constant in ohms law ?

Open in App

Solution

Ohm’s Law is about variation of current through a conductor for different values of potential difference across ends of the conductor. Now, if we consider the resistance to be changing it would imply that the conductor used is changed or there is some modification in the sample used. This would mess up the experiment and the result would be erroneous. So, the resistance is kept constant in the experiment of Ohm’s law.

Suggest Corrections

Similar questions

Why we cannot use a bulb instead of a resistor in ohm law

Q. Answer the following question:

(a) A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

(b) Is Ohms law universally applicable for all conducting elements?If not, give examples of elements which do not obey Ohms law.

(d) A high tension (HT) supply of, say, 6 kV must have a very large internal resistance. Why?

(a) State and explain joule's law of heating.
(b) A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volts find heat in joules produced by this combination of resistance in half a minute.

Q. State the Krichhoff's law of electric network. In the figure shown

P = 2 ohms Q = 4 ohms, R = 4 ohms

and

S = 2 ohms

. Resistance between

C

and

D

1 ohms

. Find the current through each resistance.

If the resistivity of a substance changes with temperature then why do we term it as a constant.

Join BYJU'S Learning Program