state ohms law and explain
Answers
Answer:
Ohm's law states that the current through a conductor is proportional to the voltage across the conductor. This is true for many materials (including metals) provided the temperature (and other physical factors) remain constant. The constant of proportionality, R,R is the resistance and has units of ohms, with symbol \Omega,Ω. The relationship can be written as:
V, equals, I, R.
V=IR
where V,V is the voltage across the conductor and I,I is the current flowing through it. If a component is ohmic (it obeys Ohm's Law), then its resistance must be independent of current and voltage. In some small components, increasing the current raises the temperature, and we can't be sure whether Ohm's law is obeyed or not. An example of this is the filament light bulb, in which the temperature rises as the current is increased. Here, Ohm's law cannot be applied. If the temperature is kept constant for the filament, using small currents, then the bulb is ohmic.
The definition of resistance is R, equals, start fraction, V, divided by, I, end fraction,R=
I
V
, which allows you to calculate a value for R,R under changing conditions of current and temperature.
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