Question

explin why during the ohm's law experiment the temperature should remain constant

Answer 1

During the ohm's law experiment the temperature should remain constant because to calculate resistance, temperature should remain constant as temperature is one of the factor which affects resistance.
If temperature increases resistance increases and if temperature decreases then resistance also decreases.

Answer 2

because if temperature increases then resistance increases and if temperature decreases resistance also decreases.. so the amount of electricity required does not reach the source.