write ohm's law and also state it's i.s. unit
Answers
Ohm’s law helps us in determining either voltage, current or impedance or resistance of a linear electric circuit when the other two quantities are known to us. It also makes power calculation simplerIt is the constant ratio that gives the unknown values of resistance,
For a wire of uniform cross-section, the resistance depends on the length l and the area of cross-section A. It also depends on the temperature of the conductor. At a given temperature the resistance,
where ρ is the specific resistance or resistivity and is characteristic of the material of wire. The specific resistance or resistivity of the material of the wire is,
If ‘r’ is the radius of the wire, then the cross-sectional area, A = πr². Then the specific resistance or resistivity of the material of the wire is,
Limitations of ohms law
Ohm’s law is not applicable to unilateral networks. Unilateral networks allow the current to flow in one direction. Such types of network consist elements like a diode, transistor, etc.
Ohm’s law is also not applicable to non – linear elements. Non-linear elements are those which do not have current exactly proportional to the applied voltage that means the resistance value of those elements changes for different values of voltage and current. Examples of non – linear elements are the thyristor.
Explanation:
i hope it help uu tq.............
