Question

13. a)
State Ohm's law. Mention the factors on which the resistance of a conductor
depend.
1
b) State Joule's law of heating and write the mathematical formula of this
law.​

Answer 1

Answer:

according to ohm's law. at constant temperature the current flowing through the conductor is directly proportional to potential difference across its end

factors are :

length of wire

nature of material

area of cross section

Answer 2

Answer:

Ohm's law

The resistance of a conductor is proportional to the flow through it, leaving the temperature and other physical conditions unchanged.

The mathematical formula of ohm's law is

V=IR (Where 'R' is resistant)

Joule's law

1.If the resistance of a conductor and the flow period are constant then the heat generated in the conductor is proportional to the square of the electric current level. Hence,H∞I²

2.If the flow rate and flow time of a conductor are constant, it is proportional to the heat resistance generated in the conductor.Hence,H∞R

3.When the flow rate and resistance in a conductor are constant, the heat flux generated in the conductor is proportional to the time. Hence,H∞T

As the rule of variation,H∞I²RT

Then,H=I²RT/J(Where J≈4.2Joule)